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N4H5S18*K*AAA*

N4H5S18*K*AAA* is in the certified data.

Its certified ratings are 7.8 HSPF2 and 15.2 SEER2.

Airquest, Day & Night + 1 more · central heat pump

N4H5S18*K*AAA* is in the certified data as of Sep 19, 2026.

5 certified pairings with 2 different figures. See all

Heating at 47°F

16,700

10,300 at 17°F

NR at 5°F

Btu/h, certified

NR COP at 5°F

Cooling at 95°F

18,000

Btu/h, certified

EER2 12.0 at 95°F

SEER2 15.2

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for N4H5S18*K*AAA*, by outdoor temperature Heating: no certified figure at 5°F, 10,300 Btu/h at 17°F, 16,700 Btu/h at 47°F. Cooling: 18,000 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 10,300 17°F 16,700 47°F 18,000 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 16,700 Btu/h of heat at 47°F and 10,300 Btu/h at 17°F. It delivers 18,000 Btu/h of cooling at 95°F. At 95°F that is 12,500 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 one 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

AHRI certificate 213199793 · listed by Day & Night · certified Aug 21, 2023 · 4 pairings share these values

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°Fone compressor speed NR NR NR
17°Fone compressor speed 10,3003.02 kW −18% NR
47°Fone compressor speed 16,7004.89 kW −7% NR
95°Fcooling, full load 18,0005.28 kW — NR

EER2 12.0 in that test. SEER2 15.2 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
1.50kW
Seasonal average heating COP
2.29

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.

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

Certified values for N4H5S18*K*AAA*

5 pairings · 5 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 one speed 16,700 Btu/h 16,500–16,700 Btu/h
Heat output at 17°F full speed 10,300 Btu/h 10,300–10,400 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 7.8 7.8
Cooling
Cooling capacity at 95°F full-load test 18,000 Btu/h 18,000–18,100 Btu/h
EER2 at 95°F 12.0 12.0
SEER2 cooling season 15.2 15.2
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-410A
Compressor Single stage
Indoor unit EA*4X19L17A* 2 indoor units
Furnace*80VSL0701716B* 5 furnaces
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 N4H5S18*K*AAA*

Pairings, by indoor-unit class

2 indoor units · 5 certified pairings

One row per indoor unit certified with this outdoor unit.

Furnace paired · 2 indoor units

  1. EA*4X19L17A* brand not stated NRat 5°F, full speed

    4 pairings, 4 with a furnace · 47°F 16,700 Btu/h · 95°F cooling 18,000 Btu/h · Cold output NR · COP —

  2. EA*4X25L17A* brand not stated NRat 5°F, full speed

    1 pairing, 1 with a furnace · 47°F 16,500 Btu/h · 95°F cooling 18,100 Btu/h · Cold output NR · COP —

Indoor units in the furnace paired class
Indoor unit Brand At 5°FBtu/h · full speed At 47°FBtu/h · one speed At 95°FBtu/h · cooling Cold output% of 47°F rating COP 5°Ffull speed Cold climate Pairings
EA*4X19L17A* — NR 16,700 18,000 NR — NC 4
EA*4X25L17A* — NR 16,500 18,100 NR — NC 1

The share is heat output at 5°F divided by the 47°F rating.

Showing 2 of 2 indoor units

Sold as, and units with identical certified values

Brands listing this model number

Other brands that list these model numbers

Model number as listed

  • N4H5S18*K*AAA* 5 pairings

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.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Aug 21, 2023
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, “N4H5S18*K*AAA* — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/n4h5s18_stk_staaa_st