AT2239
AT2239 is in the certified data.
Its certified ratings are 8.3 HSPF2 and 23.9 SEER2.
Atomi Smart · central heat pump
AT2239 is in the certified data as of Sep 19, 2026.
- 12,000 Btu (1-ton)
- Central
- Variable speed
- US and Canada
Certified heating and cooling
Heating at 47°F
12,7493.74NR
No 47°F rating for this pairing.
6,7221.97NR at 17°F
——NRNR at 5°F
Btu/hkW, certified
—NRNR COP at 5°F
Heating and cooling by outdoor temperature
This pairing delivers 12,749 Btu/h3.74 kW of heat at 47°F and 6,722 Btu/h1.97 kW at 17°F. It delivers 12,000 Btu/h3.52 kW of cooling at 95°F. At 95°F that is 8,000 Btu/h2.34 kW above the example cooling load of 4,000 Btu/h1.17 kW.
Each bar is a separate certified test, drawn at its outdoor temperature, starting at zero. The 47°F figure is at normal speed; the 17 and 5°F figures are at full speed. The short dark line on each bar is the median of 1-ton central models, one value per model. The shaded 17 to 45°F band is the frosting range: the outdoor coil can frost, and the unit pauses to defrost.
The dashed lines are example loads for a typical area of about 350 sq ft where winters reach 5°F: heating runs from 8,000 Btu/h2.34 kW at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 4,000 Btu/h1.17 kW at 95°F, at 1,000 sq ft per ton. A house in a hot climate or with large west-facing windows can need twice as much cooling. They are examples, not your building.
AHRI certificate · listed by Atomi Smart · certified Dec 3, 2024 · 1 pairing carries these values
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Threshold comparisons use the unit’s certified figures across its pairings. Programs also set service-area, installation, and product-list requirements.
Certified output and power use
| Outdoor temperature | Certified outputBtu/h | One scale | vs class median | COPat 5°F |
|---|---|---|---|---|
| 5°Ffull speed | NR— kW | NR | NR | |
| 17°Ffull speed | 6,7221.97 kW | −34% | NR | |
| 47°Fnormal speed | 12,7493.74 kW | −10% | NR | |
| 95°Fcooling, full load | 12,0003.52 kW | — | NR |
EER2 13.05 in that test. SEER2 23.9 over the modeled cooling season.
Power use at each temperature
- Electrical input in the 5°F full-speed test
- NRkW
- Electrical input in the 95°F cooling test
- 0.92kW
- Seasonal average heating COP
- 2.42
These exclude backup resistance heat.
How it compares with other 12,000 Btu heat pumps
1-ton central models
- This pairing at 5°F
- — Btu/h— kWNRNR
- This unit at 5°F median across its pairings
- NR
- Median of 1-ton central models at 5°F
- 8,200 Btu/h2.40 kW
- Models in this group
- 36
Every 12,000 Btu (1-ton) unit, ranked by cooling efficiency, then heating efficiency
Certified values for AT2239
1 pairing · 0 AHRI certificates
This pairing is the one shown above. Under all pairings, a single figure means every pairing agrees and a range means the pairing decides.
| This pairing | All pairings | |
|---|---|---|
| Heating | ||
| Heat output at 47°F normal speed | 12,749 Btu/h3.74 kWNR | 12,749 Btu/h3.74 kW |
| Heat output at 17°F full speed | 6,722 Btu/h1.97 kWNR | 6,722 Btu/h1.97 kW |
| Heat output at 5°F full speed | — Btu/h— kWNRNR | NR |
| Heat output below 5°F | NR | NR |
| Cold output 5°F output as a % of the 47°F rating | —%NRNR | NR |
| COP at 5°F full speed | —NRNR | — |
| HSPF2 Region IV | 8.3NR | 8.3 |
| Cooling | ||
| Cooling capacity at 95°F full-load test | 12,000 Btu/h3.52 kWNR | 12,000 Btu/h3.52 kW |
| EER2 at 95°F | 13.05NR | 13.05 |
| SEER2 cooling season | 23.9NR | 23.9 |
| Cooling at other temperatures | NR | NR |
| Equipment and listing | ||
| Refrigerant | R-32 | |
| Compressor | Variable speed | |
| Indoor unit | None listed | None |
| Furnace | No furnace | None |
| Cold-climate designation EPA's designation, as published | NC | NC |
| ENERGY STAR Most Efficient EPA's designation, as published | No | On no pairings |
| Where it is sold | US and Canada | US and Canada |
| Model string as certified | AT2239 | |
Pairings, by indoor-unit class
1 certified pairing
One row per indoor unit certified with this outdoor unit.
Unspecified
-
None listed (the pairing on screen) brand not stated NRat 5°F, full speed
| Indoor unit | Brand | At 5°FBtu/hkW · full speed | At 47°FBtu/hkW · normal speed | At 95°FBtu/hkW · cooling | Cold output% of 47°F rating | COP 5°Ffull speed | Cold climate | Pairings |
|---|---|---|---|---|---|---|---|---|
| None listed (the pairing on screen) | — | NR | 12,7493.74 | 12,0003.52 | NR | — | NC | 1 |
Sold as, and units with identical certified values
What affects the price
We don't have prices. These things drive the cost.
- The size of the unit, and the indoor equipment on the same certificate.
- Whether existing ductwork is reused, altered, or replaced.
- The electrical work: a circuit, a disconnect, and sometimes a panel change.
- Refrigerant line length and how the outdoor unit is mounted.
- Permits and inspection, which vary by municipality.
- Removing and disposing of the old equipment.
- Local labor rates and how busy the season is.
- Rebates and tax credits, which change and have deadlines.
Product history
- AT2239 first appeared in the certified data between March 2025 and May 2025.
History and definitions
History
- First certified record
- Most recent certified record
- Measurements reported
- Dec 3, 2024
- Status
- In the certified data
Field definitions
- COP
- Heat delivered for each unit of electricity used. A COP of 2.5 gives 2.5 times the heat of an electric baseboard heater.
- HSPF2
- Heating efficiency over a typical season. Higher uses less electricity.
- SEER2
- Cooling efficiency over a typical season. Higher uses less electricity.
- EER2
- Cooling output divided by electrical input in the 95°F full-load test, in Btu/h per watt.
- Cold output
- Heat output at 5°F as a percentage of the 47°F rating.
- % of rating at 17°F
- Heat output at 17°F as a percentage of the 47°F rating.
NR not in the certified dataNC not cold-climate certifiedSP single pairing onlyVP varies by pairing; see the pairings tableWD withdrawn since the certified data was last read