What is the SEER2 rating of the LPS Legacy N4H5S36*K*AAA?

The LPS Legacy N4H5S36*K*AAA is rated at up to 15.5 SEER2 and 12.5 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 8 certified matchups SEER2 ranges from 15.2-15.5.

Is the LPS Legacy N4H5S36*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 3-ton model.

How much does the LPS Legacy N4H5S36*K*AAA cost to run per year?

At its rated efficiency it costs about $1,109-$2,899 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,358 in Phoenix and $2,415 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the LPS Legacy N4H5S36*K*AAA the same as the LPS Legacy R4H5S36*K*AAA?

Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.

Which indoor units work with the LPS Legacy N4H5S36*K*AAA?

ENERGY STAR lists 8 certified combinations for this outdoor unit. The highest-rated ones use EA*4X37L21A, EA*4X43L21A, EVM4X49M21A.

What refrigerant does the LPS Legacy N4H5S36*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.

3-ton central heat pump · PERFORMANCE 15 SEER2 HP

LPS Legacy N4H5S36KAAA

Below average cooling and heating efficiency for a 3-ton central heat pump, but not rated for cold climates.

Ranks #269 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,219 a year to run in a mixed climate like Atlanta.

SEER2: 15.5 Cooling efficiency over a season
Below average · beats 15%
HSPF2: 7.8 Heating efficiency over a season
Below average · beats 5%
EER2: 12.5 Cooling efficiency on a 95°F day
Very good · beats 80%
Heat at 5°F: - Not reported by the maker

A good fit if…

You want a certified 3-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

Specifications3 ton, R-410A

General
Brand	LPS Legacy
Also sold as	Arcoaire, Day & Night, Keeprite, Kenmore, Tempstar, Smart Comfort
Outdoor unit model	N4H5S36KAAA
Series	PERFORMANCE 15 SEER2 HP
Type	Central heat pump
Nominal size	3 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	February 5, 2024
Cooling
SEER2Seasonal efficiency, higher is better	15.5 (range 15.2-15.5)
EER2Efficiency at 95°F outdoors	12.0-12.5
Cooling capacity	34,600-36,800 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8
Capacity at 47°F	33,600-35,800 BTU/h
Capacity at 17°F	20,200-21,600 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*4X37L21A at the standard test temperatures, in BTU/h:

Certified matchups8 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*4X37L21A	96VTN1002122B	15.5	12.5	7.8	-	213208930
EA*4X43L21A	96VTN1002122B	15.5	12.5	7.8	-	213209845
EVM4X49M21A	80MSU0802120A	15.5	12.5	7.8	-	214038816
EVM4X49M21A	96MSN1002120A	15.5	12.0	7.8	-	214038834
EVM4X44M21A	80MSU0802120A	15.5	12.5	7.8	-	214038700
EVM4X44M21A	96MSN1002120A	15.5	12.0	7.8	-	214038718
EA*4X43L21A	80VSL1102122B	15.2	12.0	7.8	-	213209358
EA*4X43L21A	80VSL1102122B	15.2	12.0	7.8	-	213209361

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the LPS Legacy N4H5S36*K*AAA: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

LPS Legacy R4H5S36*K*AAA

Yearly running cost in 10 large cities$1,109-$2,899

Phoenix, AZ$1,358/yr
Miami, FL$1,109/yr
Houston, TX$1,216/yr
Atlanta, GA$1,219/yr
Los Angeles, CA$1,184/yr
New York, NY$2,899/yr
Chicago, IL$2,351/yr
Denver, CO$1,952/yr
Seattle, WA$1,198/yr
Minneapolis, MN$2,415/yr

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

Questions6

What is the SEER2 rating of the LPS Legacy N4H5S36*K*AAA?: The LPS Legacy N4H5S36*K*AAA is rated at up to 15.5 SEER2 and 12.5 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 8 certified matchups SEER2 ranges from 15.2-15.5.
Is the LPS Legacy N4H5S36*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 3-ton model.
How much does the LPS Legacy N4H5S36*K*AAA cost to run per year?: At its rated efficiency it costs about $1,109-$2,899 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,358 in Phoenix and $2,415 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the LPS Legacy N4H5S36*K*AAA the same as the LPS Legacy R4H5S36*K*AAA?: Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
Which indoor units work with the LPS Legacy N4H5S36*K*AAA?: ENERGY STAR lists 8 certified combinations for this outdoor unit. The highest-rated ones use EA*4X37L21A, EA*4X43L21A, EVM4X49M21A.
What refrigerant does the LPS Legacy N4H5S36*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 $1,342/yrYou save $528/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 LPS Legacy N4H5S36*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: $1,342
Current system, per year: $1,871
You save per year: $528
Payback: 25.5 years
Net after 10 years: -$8,215

Cooling $831Heating $511Electricity used: 8,390 kWhSaved vs. a minimum-efficiency heat pump: $90

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 3 ton models

Heil H5H6S36*K*AAA15.5 SEER2 · 7.8 HSPF2
Tempstar T5H6S36*K*AAA15.5 SEER2 · 7.8 HSPF2
Heil B5H6S36*K*AAA15.5 SEER2 · 7.8 HSPF2
AC Pro SPHP-Z-V037BB · cold climate15.4 SEER2 · 9.8 HSPF2
Bryant PH5SAN436**AA15.5 SEER2 · 7.8 HSPF2
MOOVAIR MSHMB36R2AN · cold climate15.3 SEER2 · 9.6 HSPF2
Bryant 227TAN036**AA15.5 SEER2 · 7.8 HSPF2
Trane/American Standard 5HCL6036A1000A · cold climate15.2 SEER2 · 9.1 HSPF2

See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of February 5, 2024. How we use the data.