What is the SEER2 rating of the Airquest N4H5S18*K*AAA?

The Airquest N4H5S18*K*AAA is rated at up to 15.2 SEER2 and 12.0 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Airquest N4H5S18*K*AAA good for cold climates?

It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 1.5-ton model.

How much does the Airquest N4H5S18*K*AAA cost to run per year?

At its rated efficiency it costs about $555-$1,378 a year in electricity in large U.S. cities, depending on climate and local rates - for example $669 in Phoenix and $1,140 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Which indoor units work with the Airquest N4H5S18*K*AAA?

ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use EA*4X25L17A, EA*4X19L17A.

What refrigerant does the Airquest N4H5S18*K*AAA use?

It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

1.5-ton central heat pump · PERFORMANCE 15 SEER2 HP

Airquest N4H5S18KAAA

Below average cooling and heating efficiency for a 1.5-ton central heat pump, but not rated for cold climates.

Ranks #160 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $587 a year to run in a mixed climate like Atlanta.

SEER2: 15.2 Cooling efficiency over a season
Below average · beats 6%
HSPF2: 7.8 Heating efficiency over a season
Below average · beats 5%
EER2: 12.0 Cooling efficiency on a 95°F day
Average · beats 64%
Heat at 5°F: - Not reported by the maker

A good fit if…

You want a certified 1.5-ton central heat pump at a typical efficiency level.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
Cooling cost matters most - its SEER2 is below average for central heat pumps.
You mainly need heat - its HSPF2 is below average for central heat pumps.
You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications1.5 ton, R-410A

General
Brand	Airquest
Also sold as	Keeprite, Day & Night
Outdoor unit model	N4H5S18KAAA
Series	PERFORMANCE 15 SEER2 HP
Type	Central heat pump
Nominal size	1.5 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	July 1, 2022
Last certified	August 21, 2023
Cooling
SEER2Seasonal efficiency, higher is better	15.2 (range 15.2)
EER2Efficiency at 95°F outdoors	12.0
Cooling capacity	18,000-18,100 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8
Capacity at 47°F	16,500-16,700 BTU/h
Capacity at 17°F	10,300-10,400 BTU/h
Capacity at 5°F	-
COP at 5°F2.0 = twice as efficient as a space heater	-
ENERGY STAR cold climate	No

Heating output as it gets colder

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with EA*4X25L17A at the standard test temperatures, in BTU/h:

Certified matchups5 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. Ask your installer for the AHRI reference number of the exact system you are quoted.

Indoor unit	Furnace	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
EA*4X25L17A	80VTL0701716B	15.2	12.0	7.8	-	213201860
EA*4X19L17A	80VSL0901716B	15.2	12.0	7.8	-	213199836
EA*4X19L17A	96VSN0801716B	15.2	12.0	7.8	-	213200153
EA*4X19L17A	96VSN0601716B	15.2	12.0	7.8	-	213200118
EA*4X19L17A	80VSL0701716B	15.2	12.0	7.8	-	213199793

Yearly running cost in 10 large cities$555-$1,378

Phoenix, AZ$669/yr
Miami, FL$555/yr
Houston, TX$599/yr
Atlanta, GA$587/yr
Los Angeles, CA$567/yr
New York, NY$1,378/yr
Chicago, IL$1,114/yr
Denver, CO$923/yr
Seattle, WA$564/yr
Minneapolis, MN$1,140/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions5

What is the SEER2 rating of the Airquest N4H5S18*K*AAA?: The Airquest N4H5S18*K*AAA is rated at up to 15.2 SEER2 and 12.0 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Airquest N4H5S18*K*AAA good for cold climates?: It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 1.5-ton model.
How much does the Airquest N4H5S18*K*AAA cost to run per year?: At its rated efficiency it costs about $555-$1,378 a year in electricity in large U.S. cities, depending on climate and local rates - for example $669 in Phoenix and $1,140 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Which indoor units work with the Airquest N4H5S18*K*AAA?: ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use EA*4X25L17A, EA*4X19L17A.
What refrigerant does the Airquest N4H5S18*K*AAA use?: It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $657/yrYou save $250/yrSee details ↓

1. Where you live

StateCityElectricity ¢ per kWh

Adjust heating and cooling hours

Filled in from your city's climate. Change them if you run the system much more or less than usual.

Cooling hours full-load hours per yearHeating hours full-load hours per year

2. The heat pump Airquest N4H5S18*K*AAA

Find a model (fills in the ratings below)

SEER2 cooling efficiencyHSPF2 heating efficiencyCooling capacity BTU/hHeating capacity BTU/h

3. What it replaces

Current heatingFurnace efficiency (AFUE %)Gas price, $/thermCurrent coolingOld AC rating SEER2 (10 ≈ 15+ years old)

4. Price replace the example with your quote

Installed price, $Rebates and incentives, $ utility, state

Heat pump, per year: $657
Current system, per year: $907
You save per year: $250
Payback: 28.0 years
Net after 10 years: -$4,498

Cooling $417Heating $240Electricity used: 4,104 kWhSaved vs. a minimum-efficiency heat pump: $36

Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

Similar 1.5 ton models

AC Pro SPHP-M-1018BB15.2 SEER2 · 7.8 HSPF2
Arcoaire R4H5S18*K*AAA15.2 SEER2 · 7.8 HSPF2
GE NS17H18SA4-15.2 SEER2 · 8.0 HSPF2
Bryant 225SAN018**AA15.2 SEER2 · 7.8 HSPF2
American Standard N5HP5018A115.2 SEER2 · 8.0 HSPF2
Carrier 25SCA518A**3015.2 SEER2 · 7.8 HSPF2
Thermal Zone TZP15AZ18AJ2N · cold climate15.2 SEER2 · 8.1 HSPF2
Coleman THF2B18S2115.2 SEER2 · 7.8 HSPF2

See all 170 1.5 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of August 21, 2023. How we use the data.