What is the SEER2 rating of the Day & Night N5H8T48*K*AAA?

The Day & Night N5H8T48*K*AAA is rated at up to 18.0 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3888 certified matchups SEER2 ranges from 15.2-18.0.

Is the Day & Night N5H8T48*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 4-ton model.

How much does the Day & Night N5H8T48*K*AAA cost to run per year?

At its rated efficiency it costs about $1,270-$3,652 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,601 in Phoenix and $3,079 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 Day & Night N5H8T48*K*AAA?

ENERGY STAR lists 3888 certified combinations for this outdoor unit. The highest-rated ones use QFVA5D6021X, FTMA5B60L0D, EVD5X61M21A.

4-ton central heat pump · 2-STAGE 18 SEER HP

Day & Night N5H8T48KAAA

Average cooling efficiency and below average heating efficiency for a 4-ton central heat pump, but not rated for cold climates.

Ranks #103 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,503 a year to run in a mixed climate like Atlanta.

SEER2: 18.0 Cooling efficiency over a season
Average · beats 66%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 38%
EER2: 13.0 Cooling efficiency on a 95°F day
Very good · beats 89%
Heat at 5°F: 26,600 BTU/h50% of its 47°F output
Excellent · beats 90%

A good fit if…

You want a choice of indoor units - 3,888 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
You mainly need heat - its HSPF2 is below average for central heat pumps.

Calculate my running cost

Details

Specifications4 ton, R-454B

General
Brand	Day & Night
Also sold as	Heil, Airquest, Arcoaire, Comfortmaker, Keeprite, Tempstar, Kenmore, ACIQ, MARATHERM
Outdoor unit model	N5H8T48KAAA
Series	2-STAGE 18 SEER HP
Type	Central heat pump
Nominal size	4 ton
CompressorVariable-speed units run longer at low power	Two-stage
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 4, 2024
Last certified	October 7, 2026
Cooling
SEER2Seasonal efficiency, higher is better	18.0 (range 15.2-18.0)
EER2Efficiency at 95°F outdoors	11.7-13.5
Cooling capacity	45,500-50,500 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.5
Capacity at 47°F	48,500-52,500 BTU/h
Capacity at 17°F	30,000-32,600 BTU/h
Capacity at 5°F	23,800-26,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.06-2.32
ENERGY STAR cold climate	No

Heating output as it gets colder50% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with QFVA5D6021X at the standard test temperatures, in BTU/h:

Certified matchups3,888 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 3,888 are shown. 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.
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218695453
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218695452
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218695451
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218695450
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218695449
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218695448
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218695447
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218695446
QFVA5D6021X	-	18.0	13.0	8.5	25,800	218822090
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560720
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560721
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560719
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560722
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560725
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560726
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560723
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560724
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215560727
FTMA5B60L0D	-	18.0	13.5	8.1	24,600	215561906
EVD5X61M21A	80VSL1102122B	17.5	12.5	8.5	24,800	215625030
EVD5X61M21A	80VSL1102122B	17.5	12.5	8.5	24,800	215625028
EVD5X61M21A	80VSL1102122B	17.5	12.5	8.5	24,800	215625029
EVD5X61M21A	80VSL1102122B	17.5	12.5	8.5	24,800	215625032
EVD5X61M21A	80VSL1102122B	17.5	12.5	8.5	24,800	215625033
EVD5X61M21A	80VSL1102122B	17.5	12.5	8.5	24,800	215625031
EVD5X61M21A	80VSL1102122B	17.5	12.5	8.5	24,800	215625034
EVD5X61M21A	80VSL1102122B	17.5	12.5	8.5	24,800	215625035
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625063
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625064
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625065
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625067
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625066
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625071
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625069
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625068
EVD5X61M21A	80MSU0802120A	17.5	13.0	8.5	24,400	215625070
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625082
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625083
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625085
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625086
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625087
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625084
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625088
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625089
EVD5X61M21A	80MSU1002120A	17.5	12.5	8.5	25,000	215625090
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625114
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625113
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625112
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625117
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625116
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625115
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625119
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625120
EVD5X61M21A	80CTL0902120B	17.5	12.0	8.5	25,200	215625118
EVD5X61M21A	80CTL1102120B	17.5	12.5	8.5	25,000	215625126
EVD5X61M21A	80CTL1102120B	17.5	12.5	8.5	25,000	215625128
EVD5X61M21A	80CTL1102120B	17.5	12.5	8.5	25,000	215625127
EVD5X61M21A	80CTL1102120B	17.5	12.5	8.5	25,000	215625129
EVD5X61M21A	80CTL1102120B	17.5	12.5	8.5	25,000	215625131
EVD5X61M21A	80CTL1102120B	17.5	12.5	8.5	25,000	215625130

Yearly running cost in 10 large cities$1,270-$3,652

Phoenix, AZ$1,601/yr
Miami, FL$1,270/yr
Houston, TX$1,437/yr
Atlanta, GA$1,503/yr
Los Angeles, CA$1,474/yr
New York, NY$3,652/yr
Chicago, IL$2,977/yr
Denver, CO$2,484/yr
Seattle, WA$1,534/yr
Minneapolis, MN$3,079/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 Day & Night N5H8T48*K*AAA?: The Day & Night N5H8T48*K*AAA is rated at up to 18.0 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3888 certified matchups SEER2 ranges from 15.2-18.0.
Is the Day & Night N5H8T48*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 4-ton model.
How much does the Day & Night N5H8T48*K*AAA cost to run per year?: At its rated efficiency it costs about $1,270-$3,652 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,601 in Phoenix and $3,079 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 Day & Night N5H8T48*K*AAA?: ENERGY STAR lists 3888 certified combinations for this outdoor unit. The highest-rated ones use QFVA5D6021X, FTMA5B60L0D, EVD5X61M21A.
What refrigerant does the Day & Night N5H8T48*K*AAA use?: It uses R-454B.

Running cost and savings

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

Heat pump $1,607/yrYou save $918/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 Day & Night N5H8T48*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: $1,607
Current system, per year: $2,525
You save per year: $918
Payback: 19.6 years
Net after 10 years: -$8,819

Cooling $948Heating $659Electricity used: 10,045 kWhSaved vs. a minimum-efficiency heat pump: $333

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 4 ton models

Carrier GH8TAN548**AA18.0 SEER2 · 8.5 HSPF2
ECOTEMP W5H8T48*K*AAA18.0 SEER2 · 8.5 HSPF2
Carrier 27TPA848A**3018.0 SEER2 · 8.5 HSPF2
Friedrich RD17AZ48AJ3N · cold climate18.0 SEER2 · 8.5 HSPF2
Bryant PH8TAN548**AA18.0 SEER2 · 8.5 HSPF2
Heil H5H8T48*K*AAA18.0 SEER2 · 8.5 HSPF2
Bryant 248TAN048**AA18.0 SEER2 · 8.5 HSPF2
Kenmore (C,H,T)5H8T48*K*AAA18.0 SEER2 · 8.5 HSPF2

See all 319 4 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of October 7, 2026. How we use the data.