What is the SEER2 rating of the Guardian RHP15036B21?

The Guardian RHP15036B21 is rated at up to 15.2 SEER2 and 11.7 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 Guardian RHP15036B21 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,500 BTU/h at 5°F with a COP of 2.22, so it is still 2.2 times as efficient as electric resistance heat at that temperature.

How much does the Guardian RHP15036B21 cost to run per year?

At its rated efficiency it costs about $1,080-$2,780 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,317 in Phoenix and $2,311 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 Guardian RHP15036B21?

ENERGY STAR lists 14 certified combinations for this outdoor unit. The highest-rated ones use XAHC48FBCN1, XAHC36DBCN1+JME12C2SN1, XAHC36DBCN1+JME16C2SN1.

What refrigerant does the Guardian RHP15036B21 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 · LX SERIES

Guardian RHP15036B21

Below average cooling and heating efficiency for a 3-ton central heat pump, and certified for cold climates.

Ranks #295 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,174 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: 11.7 Cooling efficiency on a 95°F day
Average · beats 43%
Heat at 5°F: 18,500 BTU/h53% of its 47°F output
Very good · beats 80%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,500 BTU/h at 5°F.
You want a choice of indoor units - 14 certified pairings.

Think twice if…

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	Guardian
Also sold as	EVCON
Outdoor unit model	RHP15036B21
Series	LX SERIES
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Two-stage
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	April 25, 2024
Last certified	July 14, 2026
Cooling
SEER2Seasonal efficiency, higher is better	15.2 (range 15.2)
EER2Efficiency at 95°F outdoors	11.7-12.0
Cooling capacity	34,200-35,600 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8
Capacity at 47°F	33,400-34,600 BTU/h
Capacity at 17°F	21,800-22,600 BTU/h
Capacity at 5°F	17,700-18,500 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.16-2.22
ENERGY STAR cold climate	Yes

Heating output as it gets colder53% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with XAHC48FBCN1 at the standard test temperatures, in BTU/h:

Certified matchups14 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.
XAHC48FBCN1 · cold climate	RG19080C16MPS1	15.2	11.7	7.8	18,500	214648019
XAHC48FBCN1 · cold climate	RG19080C16MPS1	15.2	11.7	7.8	18,500	214648020
XAHC36DBCN1+JME12C2SN1	-	15.2	12.0	7.8	18,200	214799616
XAHC36DBCN1+JME12C2SN1	-	15.2	12.0	7.8	18,200	214799617
XAHC36DBCN1+JME16C2SN1	-	15.2	12.0	7.8	17,700	214799623
XAHC36DBCN1+JME16C2SN1	-	15.2	12.0	7.8	17,700	214799624
XAFC48FBCN1+JME12C2SN1	-	15.2	12.0	7.8	18,000	214799636
XAFC48FBCN1+JME12C2SN1	-	15.2	12.0	7.8	18,000	214799635
XAFD48FBCN1+JME18D2SN1	-	15.2	12.0	7.8	18,100	214799660
XAFD48FBCN1+JME18D2SN1	-	15.2	12.0	7.8	18,100	214799659
XAHC48FBCN1+JME16C2SN1	-	15.2	12.0	7.8	17,700	214799674
XAHC48FBCN1+JME16C2SN1	-	15.2	12.0	7.8	17,700	214799673
XAHD48FBCN1+JME18D2SN1	-	15.2	12.0	7.8	17,800	214799695
XAHD48FBCN1+JME18D2SN1	-	15.2	12.0	7.8	17,800	214799696

Yearly running cost in 10 large cities$1,080-$2,780

Phoenix, AZ$1,317/yr
Miami, FL$1,080/yr
Houston, TX$1,180/yr
Atlanta, GA$1,174/yr
Los Angeles, CA$1,138/yr
New York, NY$2,780/yr
Chicago, IL$2,252/yr
Denver, CO$1,869/yr
Seattle, WA$1,145/yr
Minneapolis, MN$2,311/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 Guardian RHP15036B21?: The Guardian RHP15036B21 is rated at up to 15.2 SEER2 and 11.7 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 Guardian RHP15036B21 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,500 BTU/h at 5°F with a COP of 2.22, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
How much does the Guardian RHP15036B21 cost to run per year?: At its rated efficiency it costs about $1,080-$2,780 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,317 in Phoenix and $2,311 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 Guardian RHP15036B21?: ENERGY STAR lists 14 certified combinations for this outdoor unit. The highest-rated ones use XAHC48FBCN1, XAHC36DBCN1+JME12C2SN1, XAHC36DBCN1+JME16C2SN1.
What refrigerant does the Guardian RHP15036B21 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 $1,299/yrYou save $490/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 Guardian RHP15036B21

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: $1,299
Current system, per year: $1,788
You save per year: $490
Payback: 26.6 years
Net after 10 years: -$8,104

Cooling $811Heating $488Electricity used: 8,117 kWhSaved vs. a minimum-efficiency heat pump: $71

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.

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See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 14, 2026. How we use the data.