The wire size for central AC 3 ton installations is typically 10 AWG copper conductors on a 30 amp double-pole breaker for standard 13-14 SEER units, though the specific wire and breaker size must be verified against the MCA and MOCP values on the AC unit nameplate per NEC Article 440. This article explains the MCA and MOCP nameplate values that govern AC wiring, why NEC Article 440 applies rather than standard branch circuit rules, typical 3 ton AC specifications by brand and SEER, the disconnect requirement per NEC 440.14, wire type selection for outdoor installations, higher SEER unit considerations, and complete installation guidance for a code-compliant 3 ton central AC circuit.

Across thousands of Southwire and Cerrowire orders shipped from IB Lighting nationwide, our electrician-led team advises DIY installers and licensed electricians on the correct wire size for residential HVAC installations including central AC condenser circuits. Founded in 2013 by a licensed Master Electrician with field experience across DTE Energy and Consumers Energy projects in Michigan, IB Lighting resells the full Southwire and Cerrowire electrical wire and cable lineup. This article is the walkthrough we provide to buyers researching wire size for their 3 ton central AC installation, using specifications aligned with the current National Electrical Code (NFPA 70) and industry practice from the International Association of Electrical Inspectors.

The Fast Answer: Wire Size for Central AC 3 Ton Installations

For a typical 3 ton central AC condenser at 13-14 SEER rating, use 10 AWG copper conductors on a 30 amp double-pole breaker. The circuit is 240 volts single-phase and does not require a neutral conductor. Standard cable is 10/2 with ground for indoor routing or three individual 10 AWG THWN-2 conductors in PVC conduit for outdoor routing. A pull-out disconnect box within sight of the condenser is required per NEC 440.14. Always verify the specific unit nameplate MCA and MOCP values before finalizing wire size because higher SEER units and specific manufacturer designs may require different wire sizes.

The complete installation specification for typical 3 ton units

The complete specification for a wire size for central AC 3 ton installation at typical 13-14 SEER includes: 10 AWG copper conductors (with 30 amp ampacity), 30 amp double-pole breaker at the electrical panel, 240 volt dedicated branch circuit, 2-conductor with ground cable configuration because AC condensers operate on 240 volts without requiring a neutral, weather-rated wire type for outdoor routing (THWN-2, UF-B, or outdoor-rated MC), and a pull-out disconnect box within sight of the condenser.

Why the answer depends on the specific unit

Unlike most residential appliances where you calculate the electrical load based on wattage or amperage rating, central AC units provide you with the exact circuit sizing values on the nameplate. The MCA (Minimum Circuit Ampacity) tells you the minimum wire ampacity needed, and the MOCP (Maximum Overcurrent Protection) tells you the maximum breaker size allowed. The 10 AWG on 30 amp answer applies to typical units but higher-efficiency models may allow 12 AWG on 20 amp breakers.

Where to find MCA and MOCP on your AC unit

The MCA and MOCP values are printed on the AC condenser nameplate, which is typically located on the side of the outdoor unit near the electrical connection point. The nameplate also lists voltage rating, phase, HP or ton capacity, refrigerant type, and other equipment data. Photograph the nameplate before purchasing wire to reference the exact values during installation.

Understanding MCA and MOCP on Your AC Nameplate

The MCA and MOCP values are the two most important numbers on any central AC condenser nameplate for determining the correct wire size and breaker specification.

What MCA means (Minimum Circuit Ampacity)

MCA stands for Minimum Circuit Ampacity and represents the minimum ampacity the branch circuit conductors must have to safely supply the AC unit under all operating conditions. The manufacturer calculates MCA using NEC 440.32 rules which apply the 125 percent factor to the largest motor plus 100 percent for other loads. MCA is the value that determines the required wire size.

What MOCP means (Maximum Overcurrent Protection)

MOCP stands for Maximum Overcurrent Protection and represents the maximum size of the overcurrent protective device (breaker or fuse) that can be used on the branch circuit. The manufacturer calculates MOCP using NEC 440.22 rules which typically allow up to 175 percent of the RLA (Rated Load Amps) or 225 percent if the lower setting causes nuisance tripping. MOCP is the value that determines the maximum breaker size.

Why MCA is smaller than MOCP

MCA and MOCP serve different purposes. MCA sizes the wire for the actual operating load with adequate margin. MOCP sizes the breaker to allow the motor to start (motors draw significantly more current at startup than during running) while still providing overcurrent protection. This is why a 3 ton AC might have MCA of 20 amps but MOCP of 30 amps, with 10 AWG wire (30 amp ampacity satisfies MCA) on a 30 amp breaker (satisfies MOCP).

The 30 amp answer for typical 3 ton units explained

Typical 3 ton central AC units at 13-14 SEER have MCA of approximately 18-25 amps and MOCP of 30-45 amps. Using 10 AWG copper on a 30 amp breaker satisfies both requirements: 10 AWG copper has 30 amp ampacity per NEC 240.4(D) small conductor rule (well above the 18-25 amp MCA), and 30 amp breaker satisfies the MOCP requirement while providing adequate motor starting current.

Why NEC Article 440 Governs Central AC Wiring

The wire size for central AC 3 ton circuits is governed by NEC Article 440 (Air Conditioning and Refrigerating Equipment) rather than by the standard branch circuit rules in NEC Article 210, and understanding this distinction clarifies why AC wire sizing follows different rules.

The scope of NEC Article 440

NEC Article 440 provides the electrical installation rules for air conditioning and refrigerating equipment including hermetic refrigerant motor-compressors and their branch circuits, disconnecting means, controls, and grounding. This scope covers residential central AC units, heat pumps, refrigeration equipment, and other hermetic compressor-based systems.

Why AC equipment gets its own article

Air conditioning equipment has unique characteristics that justify dedicated code treatment: sealed hermetic compressor motors have different starting and running characteristics than open motors, refrigerant systems require special safety considerations, outdoor installation exposes equipment to weather and physical damage risks, and cyclical operation creates duty cycle differences from continuous or intermittent loads.

How NEC 440 differs from NEC 210 for branch circuits

NEC 210 branch circuit rules generally require the load to be calculated based on connected wattage or amperage, with continuous load 125 percent factors applied as needed. NEC 440 rules require the branch circuit to be sized based on manufacturer-provided MCA and MOCP values calculated using the specific NEC 440.32 and 440.22 formulas that account for hermetic compressor characteristics. This means the manufacturer does the calculation for you.

The nameplate is the authoritative source

For any AC condenser installation, the equipment nameplate is the authoritative source for wire sizing information. Do not attempt to calculate the wire size independently using nameplate horsepower, BTU rating, or amperage draw. The MCA and MOCP values on the nameplate are the values required by NEC and any deviation from these values creates code violations regardless of the reasoning.

Typical 3 Ton Central AC Specifications by Brand and SEER

Understanding typical MCA and MOCP values across major AC manufacturers helps buyers estimate the wire size for central AC 3 ton installations before purchasing the specific unit.

Standard 13-14 SEER 3 ton units

Most standard 13-14 SEER 3 ton central AC units from major manufacturers (Carrier, Trane, Goodman, Lennox, York, Rheem, American Standard) have MCA values in the range of 18-25 amps and MOCP values of 30-45 amps. The typical wire specification is 10 AWG copper on a 30 amp double-pole breaker. Actual values vary slightly by specific model and production year.

Higher-efficiency 15-16 SEER 3 ton units

Higher-efficiency 15-16 SEER 3 ton units typically have lower MCA values in the range of 15-20 amps because more efficient compressors draw less current for the same cooling output. MOCP values are typically 25-35 amps. Some 16 SEER units allow 12 AWG copper on a 20 amp breaker while others still require 10 AWG on 25 or 30 amp breakers.

Premium 18+ SEER variable-speed 3 ton units

Premium 18+ SEER variable-speed 3 ton units have the lowest MCA values in the range of 12-18 amps because variable-speed compressors run at partial capacity most of the time. MOCP values are typically 20-30 amps. These units often allow 12 AWG copper on 20 amp breakers with wire cost savings that partially offset the higher equipment cost.

Two-stage 3 ton units

Two-stage 3 ton units combine standard efficiency at low stage with higher output at high stage. MCA values are typically in the middle range of 17-22 amps, and MOCP values are typically 25-40 amps. Wire specification is typically 10 AWG copper on 30 amp breaker but verify against the specific unit nameplate.

The NEC Math Behind the 10 AWG Answer for 3 Ton AC

The calculation that leads to the 10 AWG copper on 30 amp breaker recommendation for typical 3 ton central AC installations follows NEC Article 440 rules.

Step 1: Read MCA and MOCP from nameplate

The first step in determining the wire size for central AC 3 ton installation is to read the MCA and MOCP values directly from the unit nameplate. For a typical 13-14 SEER 3 ton unit, MCA is approximately 20 amps and MOCP is approximately 30 amps. These values are calculated by the manufacturer using NEC 440.32 and 440.22 formulas.

Step 2: Determine required wire ampacity

The wire must have ampacity equal to or greater than the MCA value. For MCA of 20 amps, the wire must have at least 20 amp ampacity. Per NEC 240.4(D) small conductor rule: 14 AWG has maximum 15 amp application, 12 AWG has maximum 20 amp application, and 10 AWG has maximum 30 amp application. 12 AWG copper (with 20 amp maximum) exactly meets the MCA of 20 amp requirement but 10 AWG provides better margin.

Step 3: Select breaker size within MOCP limit

The breaker size must be equal to or less than the MOCP value. For MOCP of 30 amps, breakers up to 30 amps are allowed. Standard residential breaker sizes are 20, 25, 30, 40 amps. Choose 30 amp for maximum motor starting capability while meeting MOCP requirements. If MOCP is 25 amps, use 25 amp breaker maximum.

Step 4: Match wire ampacity to breaker size

Once the breaker size is selected, the wire must have ampacity equal to or greater than the breaker rating per NEC 240.4. For 30 amp breaker, wire must have at least 30 amp ampacity. Per NEC 240.4(D), this means 10 AWG copper minimum. This is why the typical answer is 10 AWG on 30 amp even when MCA is only 20 amps.

Step 5: Apply the small conductor rule correctly

NEC 240.4(D) limits 12 AWG copper to 20 amp maximum overcurrent protection. This means you cannot use 12 AWG copper on a 30 amp breaker even if the actual wire ampacity is higher. For a 3 ton AC with MOCP of 30 amp, using 12 AWG wire requires downsizing the breaker to 20 amp maximum, which may not provide adequate motor starting capability for some units.

Pro tip: When planning a central AC installation, always verify the specific unit nameplate before purchasing wire. Photograph the nameplate at the equipment showroom or ask your HVAC contractor to provide the model number and nameplate details before ordering. The MCA and MOCP values are printed on every unit and take precedence over generic wire size recommendations. Purchasing wire for the wrong specification wastes money and delays installation while you exchange or return the wire.

Disconnect Requirement per NEC 440.14

Every wire size for central AC 3 ton installation requires a disconnect within sight of the equipment per NEC 440.14, which is a critical safety and code requirement often overlooked by DIY installers.

What NEC 440.14 requires

NEC 440.14 requires that a disconnecting means be located within sight and readily accessible from the air conditioning or refrigerating equipment. “Within sight” is defined as visible and not more than 50 feet distant. The disconnect provides a means to safely de-energize the equipment for service without requiring access to the main electrical panel.

Pull-out disconnect box as standard solution

The standard implementation of the NEC 440.14 disconnect requirement is a pull-out disconnect box (also called AC disconnect or AC pullout) mounted on the exterior wall within a few feet of the condenser. The pull-out disconnect is a small enclosure containing removable fuses or a pull-out cartridge that physically breaks the circuit when removed. This provides both a switch and (optionally) local overcurrent protection.

Wire routing through the disconnect

The branch circuit wire from the main panel routes to the disconnect box, terminates at the line side terminals, and continues from the load side terminals to the AC condenser unit whip (short flexible conduit). The disconnect box provides a physical break in the circuit that allows service personnel to safely work on the condenser without risk of electric shock from the main panel supply.

Sizing the disconnect box

The disconnect box must have current rating equal to or greater than the branch circuit breaker size. For a 30 amp breaker, use a 30 amp or larger disconnect. Common residential AC disconnect boxes are rated 30 or 60 amp. Fused disconnects allow local overcurrent protection matching the MOCP value while non-fused disconnects provide only the switch function.

Wire Type Selection for Outdoor Condenser Installations

Wire type selection for the wire size for central AC 3 ton installation depends on the routing environment because the condenser is always outdoors while the panel is always indoors, requiring the wire to transition through the wall and route to the outdoor location.

Individual THWN-2 conductors in PVC conduit

The most common approach for outdoor condenser wire runs is three individual 10 AWG THWN-2 copper conductors pulled through PVC conduit from the wall penetration to the disconnect box, then to the condenser. THWN-2 is specifically rated for wet locations, and PVC conduit provides UV protection and physical protection for the wire. Watertight fittings at the wall penetration and disconnect entries prevent water infiltration.

UF-B cable for direct burial applications

Some installations use UF-B 10/2 with ground cable for the outdoor portion of the run, particularly when the wire routes through the ground to reach the condenser location. UF-B is rated for direct earth burial per NEC 340 and does not require conduit. UF-B is limited to 60 degree Celsius rating, so wire sizing follows the 60 degree column but 10 AWG is adequate for typical 3 ton units.

MC cable with outdoor rating

MC cable with an outdoor-rated jacket can be used for exposed outdoor runs in some jurisdictions. The metal armor provides physical protection while the outdoor-rated jacket handles UV and weather exposure. MC cable is more expensive than individual THWN-2 in conduit but simplifies installation with fewer components.

NM-B (Romex) for indoor portion only

NM-B (Romex) is not rated for outdoor, wet, or damp locations per NEC 334.12. NM-B can only be used for the indoor portion of the wire run from the panel to a junction box at the wall penetration, with a transition to weather-rated wire (THWN-2 or UF-B) for the outdoor portion. Some installers avoid NM-B entirely and use THHN or THWN-2 in conduit throughout for consistent installation.

Higher SEER Units and Their Wire Size Impact

Higher SEER (Seasonal Energy Efficiency Ratio) central AC units typically have lower MCA values, which can allow smaller wire size for central AC 3 ton installations than standard 13-14 SEER units.

What SEER measures

SEER measures the cooling output over an entire cooling season divided by the electrical energy input. Higher SEER means more efficient units that produce more cooling per unit of electrical energy consumed. Federal minimum efficiency standards require 14 SEER minimum for new residential AC units in most regions, with 15 SEER minimum in southern regions.

Why higher SEER means lower MCA

Higher SEER units use more efficient compressor designs, larger heat exchangers, variable-speed motors, and other technologies that reduce electrical demand for the same cooling output. This reduces the RLA (Rated Load Amps) and consequently the MCA (Minimum Circuit Ampacity). A 16 SEER unit typically draws 15-20 percent less current than a comparable 13-14 SEER unit.

Wire size impact by SEER range

13-14 SEER 3 ton: MCA typically 18-25 amps, wire typically 10 AWG on 30 amp. 15-16 SEER 3 ton: MCA typically 15-20 amps, wire may allow 12 AWG on 20 amp (verify nameplate). 18+ SEER variable-speed 3 ton: MCA typically 12-18 amps, wire often allows 12 AWG on 20 amp. Always verify the specific unit nameplate before purchasing wire.

Cost tradeoff between wire and equipment

Higher SEER units cost more than lower SEER units but may save on wire costs due to lower amperage requirements. For a typical 100 foot condenser run, 12 AWG copper costs approximately 30-50 percent less than 10 AWG copper. Combined with lower operating costs from higher efficiency, the total lifetime cost analysis often favors higher SEER units even accounting for higher purchase price.

Choosing the Right Wire Product for Your 3 Ton AC Circuit

Understanding which specific wire products fit the wire size for central AC 3 ton specification helps buyers select the correct product for their installation.

Southwire 10 AWG THWN-2 for outdoor installations

Southwire manufactures individual 10 AWG THWN-2 copper conductors specifically rated for wet locations required for outdoor AC installations. Purchase three individual conductors per circuit: one black, one red, and one green (or use bare copper for grounding). Southwire THWN-2 is available in various colors and reel lengths from 50 feet to 500 feet. Stranded THWN-2 is preferred over solid for easier pulling through conduit.

Southwire 10/2 with ground UF-B

Southwire UF-B 10/2 with ground is rated for direct burial per NEC 340 and can be used for underground AC condenser wire runs. UF-B does not require conduit for the buried portion, simplifying installation. The 10/2 configuration includes two 10 AWG hot conductors plus a bare copper grounding conductor, which is the correct configuration for 240 volt AC circuits without neutral.

Cerrowire alternatives

Cerrowire manufactures comparable 10 AWG THWN-2 copper conductors and 10/2 with ground UF-B cable. Cerrowire and Southwire products are electrically equivalent and meet the same UL standards. Both brands are widely accepted by electrical inspectors for AC installations, and selection typically depends on regional availability and pricing.

PVC conduit for outdoor routing

3/4 inch PVC conduit accommodates three 10 AWG THWN-2 conductors per NEC 314.16 conduit fill calculations for outdoor AC installations. PVC conduit is UV resistant, provides physical protection, and is easier to work with than metal conduit for typical residential AC installations. Standard PVC fittings including couplings, elbows, and adapters complete the installation.

AC disconnect boxes

Standard pull-out AC disconnect boxes rated 30 or 60 amps are available at electrical wholesalers and home improvement stores. Fused disconnects allow local MOCP matching (typically 30 amp fuses) while non-fused disconnects provide only the switch function. The disconnect box must be rated for outdoor/wet location use and match or exceed the branch circuit breaker rating.

Voltage Drop Considerations for Long Condenser Runs

Voltage drop for the wire size for central AC 3 ton installations affects motor starting capability and operating efficiency, particularly for long condenser runs.

The 3 percent voltage drop guideline

NEC 210.19(A)(1) informational note recommends voltage drop under 3 percent for branch circuits to maintain adequate voltage at the load. For a 240 volt 3 ton AC condenser circuit, this means the drop should not exceed 7.2 volts at maximum operating load. Excessive voltage drop can cause motor starting issues, reduced cooling capacity, and premature motor wear.

10 AWG copper distance limits at typical 3 ton AC load

For a typical 3 ton AC condenser drawing 20 amps continuous, 10 AWG copper stays within the 3 percent voltage drop guideline for runs up to approximately 100 to 120 feet at 240 volts. Most residential AC installations stay within this distance limit. Larger properties with condensers positioned distant from the electrical panel sometimes approach or exceed this limit.

When to upgrade to 8 AWG copper

For runs 120 to 200 feet at typical 3 ton AC load, upgrade to 8 AWG copper to maintain voltage drop under 3 percent. 8 AWG copper has significant additional capacity margin and better voltage drop performance. This upgrade adds moderate cost but ensures reliable AC operation at maximum load conditions.

Motor starting inrush considerations

AC compressor motors draw significantly more current during startup (typically 4-8 times the running current) for the first few seconds of operation. Excessive voltage drop during starting can cause motor stall, thermal overload trips, or nuisance breaker trips. Larger wire sizes reduce starting voltage drop and improve motor starting reliability, which is particularly important for AC units in areas with hot summer weather.

Air Handler Circuit vs Condenser Circuit

Central AC systems typically have two separate electrical circuits: the outdoor condenser circuit covered in this article and the indoor air handler circuit which has different requirements.

Air handler electrical requirements

The indoor air handler (blower unit) is typically supplied by a separate 15 or 20 amp 120 volt or 240 volt circuit depending on the specific unit design. Some air handlers include electric heat strips (backup heat for heat pumps or supplemental heat) which require larger circuits. Verify air handler nameplate for specific circuit requirements.

Separate branch circuits typically required

The condenser and air handler are typically wired on separate branch circuits because they have different amperage requirements, different service disconnect requirements, and different maintenance access needs. This separation allows one unit to be de-energized for service without affecting the other, and provides independent overcurrent protection for each unit.

Combined thermostat wiring

While the electrical branch circuits are separate, the condenser and air handler share thermostat control wiring (typically 18 AWG multi-conductor cable). The thermostat wiring is low-voltage 24 volt control wiring that coordinates operation of the two units. Thermostat wiring is not covered by the same wire sizing rules as the branch circuits.

Heat strip circuit considerations

Air handlers with electric heat strips (backup or supplemental heat) require additional dedicated circuits sized based on the heat strip amperage. A typical 10 kW electric heat strip package requires a 60 amp 240 volt circuit with 6 AWG copper wire. Combined heat strip installations may require multiple dedicated circuits totaling significant electrical service capacity.

3 Ton Heat Pump vs 3 Ton AC Wire Size Differences

3 ton heat pumps and 3 ton AC condensers have similar cooling capacity but heat pumps have additional considerations that can affect wire sizing.

Similar cooling circuit requirements

3 ton heat pumps operate similarly to 3 ton AC condensers in cooling mode with comparable MCA and MOCP values. The condenser circuit wire size for a 3 ton heat pump is typically the same 10 AWG copper on 30 amp breaker specification as a 3 ton AC. In cooling mode, the electrical characteristics are essentially identical.

Heat pump auxiliary heat requirements

Heat pumps provide primary heating using the reversing valve to move heat from outside to inside. However, most heat pump systems include auxiliary heat strips or backup heat sources for cold weather when the heat pump alone cannot maintain indoor temperature. Auxiliary heat strips require additional dedicated circuits sized based on the specific heat strip amperage.

Defrost cycle current draw

Heat pumps periodically enter defrost mode to remove ice from the outdoor coil, which briefly reverses to cooling mode and often energizes auxiliary heat. Defrost cycles do not affect the condenser circuit wire size but may briefly increase total system electrical demand. MCA and MOCP values on the heat pump nameplate account for defrost operation.

Higher SEER heat pumps

Higher SEER heat pumps have lower MCA values in cooling mode, similar to higher SEER AC units. HSPF (Heating Seasonal Performance Factor) is the equivalent efficiency measure for heating mode. Modern heat pumps with high SEER and HSPF ratings often allow the same wire size as higher-efficiency AC units, with 12 AWG on 20 amp breaker possible for some premium variable-speed models.

5 Common Mistakes When Wiring a 3 Ton Central AC

The mistakes below cause the most frequent buyer questions about wire size for central AC 3 ton installations.

Mistake 1: Ignoring the nameplate and using generic wire size

The most common mistake is applying a generic wire size (like “10 AWG for all central AC”) without verifying the specific unit nameplate MCA and MOCP values. While 10 AWG on 30 amp works for most 13-14 SEER 3 ton units, higher SEER units may require smaller wire and specific unit designs may require larger wire. Always verify the nameplate before purchasing wire.

Mistake 2: Skipping the required disconnect per NEC 440.14

Some DIY installers omit the pull-out disconnect box near the condenser, running wire directly from the panel to the condenser. NEC 440.14 requires a disconnecting means within sight of the equipment. Skipping the disconnect is a code violation that always fails inspection and creates safety hazards for service personnel.

Mistake 3: Using NM-B (Romex) for the outdoor portion of the wire run

NM-B is not rated for outdoor, wet, or damp locations per NEC 334.12. Using NM-B for the wire run from the wall penetration to the condenser or disconnect box violates code and creates safety hazards from water damage. Use THWN-2 in PVC conduit or UF-B cable for the outdoor portion of the run.

Mistake 4: Undersized breaker below the MOCP requirement

Using a breaker size smaller than the MOCP value may cause nuisance tripping during motor starting or high-load operation. The MOCP is the maximum breaker size allowed, not a minimum requirement, but breakers significantly smaller than MOCP often trip during normal AC operation. Match the breaker to the MOCP value for reliable operation.

Mistake 5: Missing weather protection at wire routing

Some installations use appropriate wire types but fail to provide adequate weather protection at wire routing points. Common issues include wall penetrations without watertight seals, disconnect boxes with missing gaskets, and conduit connections without proper weatherproof fittings. Water infiltration causes wire insulation degradation and equipment damage over time.

Conclusion

The typical wire size for central AC 3 ton installations is 10 AWG copper conductors on a 30 amp double-pole breaker for standard 13-14 SEER units, though the specific wire and breaker size must always be verified against the MCA and MOCP values on the specific unit nameplate per NEC Article 440. Higher SEER units and specific manufacturer designs may allow smaller wire sizes.

Key installation requirements include weather-rated wire types for the outdoor portion of the run (THWN-2 in PVC conduit or UF-B cable), a pull-out disconnect box within sight of the condenser per NEC 440.14, 240 volt dedicated branch circuit with 2-conductor plus ground cable configuration (no neutral required), and matching the breaker size to the nameplate MOCP for reliable motor starting operation.

This article was last reviewed and updated in June 2026 to reflect current National Electrical Code requirements and residential central AC installation best practices. Wire sizing recommendations are based on the current NEC (NFPA 70) and typical residential 3 ton AC specifications. Always verify the specific unit nameplate MCA and MOCP values before purchasing wire. For complex installations or when in doubt, consult a licensed electrician or HVAC technician. Central AC installations involve refrigerant handling requiring EPA certification for the refrigerant portion of the work.