Cirrus SR22 G3 Air Conditioning: Kelly Electric vs. Factory A/C

Air conditioning belongs on an SR22 buyer’s checklist—but the words “air conditioning” do not tell you which system you are buying.

For a Cirrus SR22 G3, the important distinction is between the factory system’s engine-mounted compressor and Kelly Aerospace’s electric ThermaCool retrofit. Kelly offers a useful advantage for hot-weather departures: cabin pre-cooling from suitable ground power before the engine starts. The buying decision also involves electrical capacity, loading limits, maintenance records and the condition of the actual installation.

Neither label, by itself, makes one airplane the better purchase.

The Short Answer

Kelly electric A/C is worth considering when engine-off pre-cooling matters to your mission. Factory A/C is worth considering as part of an airplane whose overall equipment, maintenance position and useful load fit your needs. Do not assume that an electric system has no electrical-management requirements, or that preserving baggage space preserves the original baggage weight limit.

This comparison concerns SR22 G3 aircraft and the documents identified below. It is not a substitute for the current, aircraft-specific POH and approved supplements, and should not be applied automatically to an SR22T or another generation.

What Makes Kelly ThermaCool Different?

Kelly’s Cirrus system uses a 28-volt brushless electric compressor. The manufacturer lists approximately 45 amps in normal operation and 55 amps at peak load. Air reaches the occupants through a ducted headliner, with temperature and fan settings selected on a digital controller.

Its most distinctive convenience is GPU-powered pre-cooling. That can make boarding more pleasant after an airplane has been sitting in the sun, without running the engine simply to start cooling the cabin. Confirm that your home airport and regular destinations can provide an appropriate ground power supply; a benefit that depends on equipment you cannot access may matter less in practice. Kelly’s Cirrus system overview

Factory A/C: Read the Applicable Supplement

Cirrus supplement 13772-127, Revision 01, dated March 27, 2007, describes an engine-mounted compressor and states that the engine must be running for the air conditioner to operate. For G3-wing aircraft, it describes the evaporator beneath the front passenger seat and conditioned-air distribution through the cabin’s outlets.

That supplement also calls for A/C off before takeoff. Its performance section identifies reductions while the system is operating, including approximately 50 feet per minute in maximum climb rate and two knots in cruise speed.

Those details belong to that specific supplement—not a blanket rule for every airplane advertised as a G3. The aircraft’s applicable POH, configuration and supplements control. Source: Cirrus 13772-127 Rev. 01, pages 2, 7–10; available through Cirrus Technical Publications.

Electric Does Not Mean Electrically Unrestricted

Kelly’s installation manual specifies a 100-amp ES-10024 alternator upgrade for SR22 serial numbers before 22-3206, together with the applicable wiring changes. A buyer should verify the installed alternator and installation records rather than infer compatibility from the model year. Kelly installation manual NC-14-022 Rev. M, pages 4 and 7

Kelly’s approved flight manual supplement requires A/C off during engine start and warns that extended operation at idle can allow bus voltage to fall below 24 volts. It also includes an A/C shutdown procedure for an alternator or other electrical failure. Its performance section specifies no changes.

The practical lesson is straightforward: an electric compressor changes how the system is powered; it does not eliminate the need to understand the airplane’s electrical system. Kelly AFMS NC-14-023 Rev. A, printed pages 4–8

Baggage Space and Baggage Weight Are Different

This is an easy detail to miss in a listing.

Kelly advertises preservation of baggage-area space, but its approved supplement reduces the baggage compartment’s distributed floor limit from 130 to 110 pounds. Physical room for a bag is not the same thing as permission to load it. Kelly AFMS, printed page 4

The Kelly weight-and-balance report lists 52 pounds for the A/C kit, excluding the alternator power source. That is not a promise that every installation changes empty weight by exactly 52 pounds. Use the airplane’s current equipment list, empty weight and center of gravity—not a brochure number—to evaluate your passenger, fuel and baggage combinations. Kelly weight-and-balance report NC-14-017 Rev. A, page 3

What to Check Before Buying an A/C-Equipped G3

Ask for more than confirmation that cold air comes out of the vents.

• System identity: Is this factory A/C or a Kelly installation? Does the equipment list agree with the advertisement?
• Approved paperwork: Are the applicable supplements and modification records present?
• Electrical configuration: For Kelly-equipped aircraft, is the required alternator and wiring configuration documented?
• Loading: Does the current weight-and-balance report reflect the installation, and do the baggage placards match the approved limitations?
• Condition: Have the prebuy shop evaluate operation, controls, airflow, leaks and maintenance history using the applicable maintenance instructions.
• Mission fit: Can the airplane carry your actual people, baggage and fuel within its limits?

Ask the shop to identify discrepancies and quote needed work. Avoid assuming either system is inherently cheaper to maintain, more reliable or worth a fixed resale premium without evidence for the aircraft being considered.

Frequently Asked Questions

Can Kelly A/C cool an SR22 with the engine off?

Yes, Kelly describes pre-cooling using a suitable ground power supply. Do not confuse this with a promise of sustained battery-only cooling.

Does Kelly A/C leave the baggage compartment unchanged?

Not in every sense. Preserved storage space does not override the approved supplement’s lower distributed floor-load limit.

Should I reject a G3 because it has factory A/C rather than Kelly?

Not on that fact alone. Compare the complete airplanes: configuration, records, current condition, loading capability and acquisition cost. A/C should support the buying decision, not substitute for it.

Aerista’s Take

Start with the way you fly. If hot-weather boarding and access to ground power are recurring parts of your trips, Kelly’s pre-cooling capability deserves attention. If a factory-A/C airplane otherwise fits the mission, evaluate its documented condition and operating requirements rather than discounting it because the compressor is not electric.

The best purchase is the airplane that fits the whole mission—and has the records to support what the listing says. Explore Aerista’s Cirrus inventory, read our pre-owned SR22 buyer’s guide, or talk with the Aerista team about the aircraft you are comparing.