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AT2240

AT2240 is in the certified data.

Its certified ratings are 8.9 HSPF2 and 21.2 SEER2.

Atomi Smart · central heat pump

All 4 certified Atomi Smart models

AT2240 is in the certified data as of Sep 19, 2026.

Heating at 47°F

19,282

11,575 at 17°F

NR at 5°F

Btu/h, certified

NR COP at 5°F

Cooling at 95°F

18,100

Btu/h, certified

EER2 13.15 at 95°F

SEER2 21.2

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for AT2240, by outdoor temperature Heating: no certified figure at 5°F, 11,575 Btu/h at 17°F, 19,282 Btu/h at 47°F. Cooling: 18,100 Btu/h at 95°F. The bars start at zero. Median of 1.5-ton central models: 11,200 Btu/h at 5°F, 12,600 Btu/h at 17°F, 18,000 Btu/h at 47°F, 18,000 Btu/h at 95°F. 0 5,000 10,000 15,000 20,000 Btu/h NR 5°F 11,575 17°F 19,282 47°F 18,100 95°F Outdoor temperature (°F)
  • Heating output
  • Cooling output
  • Median of 1.5-ton central models
  • Example heating load
  • Example cooling load
  • Frosting range, 17 to 45°F

This pairing delivers 19,282 Btu/h of heat at 47°F and 11,575 Btu/h at 17°F. It delivers 18,100 Btu/h of cooling at 95°F. At 95°F that is 12,600 Btu/h above the example cooling load of 5,500 Btu/h.

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 1.5-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 450 sq ft where winters reach 5°F: heating runs from 11,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 5,500 Btu/h 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.

Calculate heating and cooling for your house

listed by Atomi Smart · certified Dec 3, 2024 · 1 pairing carries these values

Rebates where you live

Meets the recorded equipment thresholds of 41 programs in 26 states, provinces, or territories:Alabama (1), Arizona (1), California (3), Colorado (1), Delaware (2), Idaho (2), Illinois (1), Kansas (1), Kentucky (1), Maryland (3), Michigan (2), Minnesota (2), Mississippi (2), Nevada (1), New Jersey (4), North Carolina (1), Oregon (2), Pennsylvania (4), South Carolina (1), Tennessee (1), Texas (3), Utah (1), Washington (2), Wisconsin (1), British Columbia (3), Newfoundland and Labrador (1).

All 41 programs by state and province

Alabama

Arizona

California

Colorado

Delaware

Idaho

Illinois

Kansas

Kentucky

Maryland

Michigan

Minnesota

Mississippi

Nevada

New Jersey

North Carolina

Oregon

Pennsylvania

South Carolina

Tennessee

Texas

Utah

Washington

Wisconsin

British Columbia

Newfoundland and Labrador

Threshold comparisons use the unit’s median certified figures across its pairings, not the pairing selected above. Meeting these thresholds means the equipment may qualify; it does not guarantee approval. Service-area, installation, and product-list requirements also apply.

All rebate programs and their published thresholds

Certified output and power use

Certified output for the selected pairingThe four bars share one scale. The comparison is with the median of 1.5-ton central models. Heating tests run at 70°F indoors. The cooling test runs at 80°F indoors.
Outdoor temperature Certified outputBtu/h One scale vs class median COPat 5°F
5°Ffull speed NR NR NR
17°Ffull speed 11,5753.39 kW −8% NR
47°Fnormal speed 19,2825.65 kW +7% NR
95°Fcooling, full load 18,1005.30 kW — NR

EER2 13.15 in that test. SEER2 21.2 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
1.38kW
Seasonal average heating COP
2.61

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 18,000 Btu heat pumps

1.5-ton central models

This pairing at 5°F
NR
This unit at 5°F median across its pairings
NR
Median of 1.5-ton central models at 5°F
11,200 Btu/h
Models in this group
243

This size class is defined by cooling capacity, so cooling is not compared here.

Among 18,000 Btu central models, each by its median certified pairing, highest first: HSPF2, 124th of 254 (tied). Models without that figure are left out.

Similar ratings at 47°F

These central models share the nominal cooling size. Comparisons use each model’s median certified figures across pairings.

  • GH5SAN519**AA*: 19,400 Btu/h at 47°F (this model: 19,282); HSPF2 8.0 (this model: 8.9).
  • MHD-18: 19,500 Btu/h at 47°F (this model: 19,282); HSPF2 9.5 (this model: 8.9).
  • HHS-18HD-B: 19,000 Btu/h at 47°F (this model: 19,282); HSPF2 10.5 (this model: 8.9).

Every 18,000 Btu (1.5-ton) unit, ranked by cooling efficiency, then heating efficiency

Certified values for AT2240

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 pairingAll pairings
Heating
Heat output at 47°F normal speed 19,282 Btu/h 19,282 Btu/h
Heat output at 17°F full speed 11,575 Btu/h 11,575 Btu/h
Heat output at 5°F full speed NR NR
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating NR NR
COP at 5°F full speed NR —
HSPF2 Region IV 8.9 8.9
Cooling
Cooling capacity at 95°F full-load test 18,100 Btu/h 18,100 Btu/h
EER2 at 95°F 13.15 13.15
SEER2 cooling season 21.2 21.2
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-32
Compressor Variable speed
Indoor unit None listed None
FurnaceNo 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 AT2240

Pairings, by indoor-unit class

1 certified pairing

One row per indoor unit certified with this outdoor unit.

Unspecified

  1. None listed brand not stated NRat 5°F, full speed

    1 pairing · 47°F 19,282 Btu/h · 95°F cooling 18,100 Btu/h · Cold output NR · COP —

Indoor units in the unspecified class
Indoor unit Brand At 5°FBtu/h · full speed At 47°FBtu/h · normal speed At 95°FBtu/h · cooling Cold output% of 47°F rating COP 5°Ffull speed Cold climate Pairings
None listed — NR 19,282 18,100 NR — NC 1

The share is heat output at 5°F divided by the 47°F rating. Tests use different compressor speeds.

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • AT2240 1 pairing

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

  • AT2240 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

Cite or print this page

Heat Pump List, “AT2240 — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/at2240