What is the SEER2 rating of the Trane 5TWX5048A1?

The Trane 5TWX5048A1 is rated at up to 16.0 SEER2 and 12.0 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 101 certified matchups SEER2 ranges from 15.2-16.0.

Is the Trane 5TWX5048A1 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 3.5-ton model.

How much does the Trane 5TWX5048A1 cost to run per year?

At its rated efficiency it costs about $1,303-$3,253 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,575 in Phoenix and $2,693 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 Trane 5TWX5048A1?

ENERGY STAR lists 101 certified combinations for this outdoor unit. The highest-rated ones use 5PX*C009AS3+TSTAT+P0V0C000M50SD, 5PX*D010AS3+TSTAT+P0V0D000M50SD, 5PX*D010AS3+TSTAT+P0V0C000M50SD.

3.5-ton central heat pump · 15 Single-Stage Heat Pump with WeatherGuard Top

Trane 5TWX5048A1

Below average cooling and heating efficiency for a 3.5-ton central heat pump, but not rated for cold climates.

Ranks #66 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,383 a year to run in a mixed climate like Atlanta.

SEER2: 16.0 Cooling efficiency over a season
Below average · beats 26%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 38%
EER2: 12.0 Cooling efficiency on a 95°F day
Average · beats 64%
Heat at 5°F: 22,600 BTU/h52% of its 47°F output
Very good · beats 88%

A good fit if…

You want a choice of indoor units - 101 certified pairings.

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.
Comfort and noise matter - a single-stage compressor runs only full-on or off.

Calculate my running cost

Details

Specifications3.5 ton, R-454B

General
Brand	Trane
Outdoor unit model	5TWX5048A1
Series	15 Single-Stage Heat Pump with WeatherGuard Top
Type	Central heat pump
Nominal size	3.5 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	February 1, 2024
Last certified	June 3, 2026
Cooling
SEER2Seasonal efficiency, higher is better	16.0 (range 15.2-16.0)
EER2Efficiency at 95°F outdoors	11.7-12.0
Cooling capacity	43,000-46,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.5
Capacity at 47°F	42,000-44,000 BTU/h
Capacity at 17°F	27,600-29,200 BTU/h
Capacity at 5°F	21,400-22,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00-2.30
ENERGY STAR cold climate	No

Heating output as it gets colder52% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 5PX*C009AS3+TSTAT+P0V0C000M50SD at the standard test temperatures, in BTU/h:

Certified matchups101 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 101 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.
5PX*C009AS3+TSTAT+P0V0C000M50SD	-	16.0	12.0	8.1	22,200	215687523
5PX*D010AS3+TSTAT+P0V0D000M50SD	-	16.0	12.0	8.1	22,200	215687615
5PX*D010AS3+TSTAT+P0V0C000M50SD	-	16.0	12.0	8.1	21,800	215687614
5TXCC009AS3+TSTAT+P0V0C000M50SD	-	16.0	12.0	8.1	22,200	215687663
5TEMCD06AV41+TDR+TSTAT	-	16.0	12.0	8.1	22,000	215863984
5TEMCD07AV51+TDR+TSTAT	-	16.0	12.0	8.1	22,000	215863985
5PX*D008AS3+TSTAT+P0V0D000M50SD	-	16.0	12.0	8.0	22,200	215687601
5PX*D010AS3+TSTAT	L8V1C100U5VSB	16.0	12.0	8.0	21,600	215687612
5TXCD008AS3+TSTAT+P0V0D000M50SD	-	16.0	12.0	8.0	22,200	215687705
5TEM6D07AV51+TDR+TSTAT	-	15.5	12.0	8.5	22,600	214182959
5TXCD010AS3+TSTAT	S9X2D120U5PSB	15.5	11.7	8.1	22,000	214183088
5TXCD010AS3+TSTAT	S9V2D120U5PSB	15.5	12.0	8.1	22,000	214183169
5TXCD010AS3+TSTAT	S9V2D120U5PSC	15.5	12.0	8.1	22,000	214183171
5TXCD010AS3+TSTAT	S9V2D120U5VSA	15.5	12.0	8.1	22,000	214183174
5TXCD010AS3+TSTAT	S9V2D120U5VSB	15.5	12.0	8.1	22,000	214183176
5TXCD010AS3+TSTAT	S9X1D120U5PSB	15.5	11.7	8.1	22,000	214183182
5TEM6D06AV41+TDR+TSTAT	-	15.5	12.0	8.1	22,600	214182957
5TXCD010AS3+TSTAT	S9V2C100U4VSB	15.5	11.7	8.1	21,800	214183137
5PX*D010AS3+TSTAT	S9X1D120U5PSB	15.5	12.0	8.1	22,200	215687606
5PX*D010AS3+TSTAT	S9X2D120U5PSB	15.5	12.0	8.1	22,200	215687609
5PX*D010AS3+TSTAT	S9X2C080U5PSB	15.5	11.7	8.1	21,800	215687611
5PX*D010AS3+TSTAT	S8X1D120M5PSC	15.5	11.7	8.1	22,400	215687625
5PX*D010AS3+TSTAT	S8X1D120M5PTC	15.5	11.7	8.1	22,400	215687626
5PX*D010AS3+TSTAT	S8X2D120M5PSC	15.5	11.7	8.1	22,400	215687631
5PX*D010AS3+TSTAT	S8X2D120M5PTC	15.5	11.7	8.1	22,400	215687632
5PX*D010AS3+TSTAT	S9X1C080U5PSB	15.5	11.7	8.1	21,800	215687640
5PX*DD10AS3+TSTAT+P0V0D000M50SD	-	15.5	12.0	8.1	22,000	215687646
5PX*DD10AS3+TSTAT+P0V0C000M50SD	-	15.5	11.7	8.1	21,800	215687647
5PX*D010AS3+TSTAT	S9V2C100U5VSB	15.5	11.7	8.1	22,000	215831720
5PX*D010AS3+TSTAT	S9V2C080U5VSB	15.5	11.7	8.1	22,200	215831721
5TXCD010AS3+TSTAT	S9V2C100U5VSB	15.5	11.7	8.1	22,000	215831731
5TXCD010AS3+TSTAT	S9V2C080U5VSB	15.5	11.7	8.1	22,200	215831732
5TEMCD05AV41+TDR+TSTAT	-	15.5	12.0	8.1	21,800	215863983
5TXCD010AS3+TSTAT	S8V2D120M5PCA	15.5	12.0	8.0	22,000	214183098
5TXCD010AS3+TSTAT	S8V2D120M5PDA	15.5	12.0	8.0	22,000	214183102
5TXCD010AS3+TSTAT	S8X1D120M5PSC	15.5	11.7	8.0	22,200	214183114
5TXCD010AS3+TSTAT	S8X1D120M5PTC	15.5	11.7	8.0	22,200	214183116
5TXCD010AS3+TSTAT	S8X2D120M5PSC	15.5	11.7	8.0	22,200	214183127
5TXCD010AS3+TSTAT	S8X2D120M5PTC	15.5	11.7	8.0	22,200	214183129
5TXCD010AS3+TSTAT+P0V0D000M50SD	-	15.5	12.0	8.0	21,800	214183145
5PX*C009AS3+TSTAT	L8V1C100U5VSB	15.5	12.0	8.0	22,000	215687525
5PX*D010AS3+TSTAT	S8V2C100M5PCB	15.5	11.7	8.0	21,800	215687618
5PX*D010AS3+TSTAT	S8V2C100M5PDB	15.5	11.7	8.0	21,800	215687619
5TXCC009AS3+TSTAT	L8V1C100U5VSB	15.5	12.0	8.0	22,000	215687665
5TXCD010AS3+TSTAT	S8V2C100M5PCA	15.5	11.7	7.8	21,400	214183090
5TXCD010AS3+TSTAT	S8V2C100M5PDA	15.5	11.7	7.8	21,400	214183094
5TXCD010AS3+TSTAT	S8V2D120M5PCB	15.5	11.7	7.8	22,200	214183100
5TXCD010AS3+TSTAT	S8V2D120M5PDB	15.5	11.7	7.8	22,200	214183104
5TXCD010AS3+TSTAT	S8X1C080M5PTC	15.5	12.0	7.8	21,400	214183108
5TXCD010AS3+TSTAT	S8X1C100M5PTC	15.5	11.7	7.8	21,400	214183112
5TXCD010AS3+TSTAT	S8X2C080M5PTC	15.5	12.0	7.8	21,400	214183121
5TXCD010AS3+TSTAT	S8X2C080M5PSC	15.5	12.0	7.8	21,400	214183118
5TXCD010AS3+TSTAT	S8X2C100M5PSC	15.5	11.7	7.8	21,400	214183123
5TXCD010AS3+TSTAT	S8X2C100M5PTC	15.5	11.7	7.8	21,400	214183125
5TXCD010AS3+TSTAT	S8V2C080M5PCA	15.5	11.7	7.8	21,600	214183153
5TXCD010AS3+TSTAT	S8V2C080M5PDA	15.5	11.7	7.8	21,600	214183157
5TXCD010AS3+TSTAT	S8V2C080M5PCB	15.5	11.7	7.8	21,600	214183155
5TXCD010AS3+TSTAT	S8V2C080M5PDB	15.5	11.7	7.8	21,600	214183151
5TXCD010AS3+TSTAT	S9V2C100U4VSA	15.2	11.7	8.1	21,800	214183135
5TXCD010AS3+TSTAT	*UHMD120CCV5	15.2	11.7	8.1	22,200	214183147

Yearly running cost in 10 large cities$1,303-$3,253

Phoenix, AZ$1,575/yr
Miami, FL$1,303/yr
Houston, TX$1,410/yr
Atlanta, GA$1,383/yr
Los Angeles, CA$1,336/yr
New York, NY$3,253/yr
Chicago, IL$2,631/yr
Denver, CO$2,179/yr
Seattle, WA$1,332/yr
Minneapolis, MN$2,693/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 Trane 5TWX5048A1?: The Trane 5TWX5048A1 is rated at up to 16.0 SEER2 and 12.0 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 101 certified matchups SEER2 ranges from 15.2-16.0.
Is the Trane 5TWX5048A1 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 3.5-ton model.
How much does the Trane 5TWX5048A1 cost to run per year?: At its rated efficiency it costs about $1,303-$3,253 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,575 in Phoenix and $2,693 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 Trane 5TWX5048A1?: ENERGY STAR lists 101 certified combinations for this outdoor unit. The highest-rated ones use 5PX*C009AS3+TSTAT+P0V0C000M50SD, 5PX*D010AS3+TSTAT+P0V0D000M50SD, 5PX*D010AS3+TSTAT+P0V0C000M50SD.
What refrigerant does the Trane 5TWX5048A1 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 $1,546/yrYou save $724/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 Trane 5TWX5048A1

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: $1,546
Current system, per year: $2,270
You save per year: $724
Payback: 22.8 years
Net after 10 years: -$9,256

Cooling $979Heating $567Electricity used: 9,660 kWhSaved vs. a minimum-efficiency heat pump: $192

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 3.5 ton models

American Standard 5HPL5048A1 · cold climate16.0 SEER2 · 8.1 HSPF2
American Standard N5HP5042A116.0 SEER2 · 8.1 HSPF2
Friedrich RD16AY48AJVC · cold climate16.0 SEER2 · 8.5 HSPF2
American Standard N5HP5048A116.0 SEER2 · 8.1 HSPF2
MRCOOL MVP-48-HP-C-230A00-O · cold climate16.0 SEER2 · 9.0 HSPF2
Ameristar A5HP5048A116.0 SEER2 · 8.1 HSPF2
Innovair SOV48H2BA · cold climate16.0 SEER2 · 9.0 HSPF2
DuraSTAR DRHP15B42AJ2AN · cold climate16.0 SEER2 · 8.1 HSPF2

See all 138 3.5 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 3, 2026. How we use the data.