What is the SEER2 rating of the 1HVAC ACIQ-PHH1748000K000V?

The 1HVAC ACIQ-PHH1748000K000V is rated at up to 17.8 SEER2 and 11.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the 1HVAC ACIQ-PHH1748000K000V good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 46,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.

How much does the 1HVAC ACIQ-PHH1748000K000V cost to run per year?

At its rated efficiency it costs about $1,243-$3,459 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,551 in Phoenix and $2,905 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

What refrigerant does the 1HVAC ACIQ-PHH1748000K000V 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.

4-ton packaged heat pump · Extreme Heat Inverter Rooftop

1HVAC ACIQ-PHH1748000K000V

Very good cooling and heating efficiency for a 4-ton packaged heat pump, and certified for cold climates.

Ranks #3 of 17 4 ton packaged heat pumps for cooling efficiency, and costs about $1,434 a year to run in a mixed climate like Atlanta.

SEER2: 17.8 Cooling efficiency over a season
Very good · beats 81%
HSPF2: 8.5 Heating efficiency over a season
Very good · beats 73%
EER2: 11.0 Cooling efficiency on a 95°F day
Below average · beats 17%
Heat at 5°F: 46,000 BTU/h98% of its 47°F output
Below average · beats 33%

A good fit if…

You want low cooling bills - its SEER2 beats 81% of packaged heat pumps.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 46,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 73% of packaged heat pumps.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications4 ton, R-410A

General
Brand	1HVAC
Also sold as	ACIQ, DIYCOOL, Stealth Comfort
Outdoor unit model	ACIQ-PHH1748000K000V
Series	Extreme Heat Inverter Rooftop
Type	Packaged heat pump
Nominal size	4 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	August 8, 2024
Last certified	June 29, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.8 (range 17.8)
EER2Efficiency at 95°F outdoors	11.0
Cooling capacity	47,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.5
Capacity at 47°F	47,000 BTU/h
Capacity at 17°F	36,000 BTU/h
Capacity at 5°F	46,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80
ENERGY STAR cold climate	Yes

Heating output as it gets colder98% kept at 5°F

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

Certified matchups4 indoor units

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

Indoor unit	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
- · cold climate	17.8	11.0	8.5	46,000	215387220
- · cold climate	17.8	11.0	8.5	46,000	215387224
- · cold climate	17.8	11.0	8.5	46,000	215387228
- · cold climate	17.8	11.0	8.5	46,000	215387232

Yearly running cost in 10 large cities$1,243-$3,459

Phoenix, AZ$1,551/yr
Miami, FL$1,243/yr
Houston, TX$1,391/yr
Atlanta, GA$1,434/yr
Los Angeles, CA$1,401/yr
New York, NY$3,459/yr
Chicago, IL$2,815/yr
Denver, CO$2,345/yr
Seattle, WA$1,445/yr
Minneapolis, MN$2,905/yr

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

Questions4

What is the SEER2 rating of the 1HVAC ACIQ-PHH1748000K000V?: The 1HVAC ACIQ-PHH1748000K000V is rated at up to 17.8 SEER2 and 11.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the 1HVAC ACIQ-PHH1748000K000V good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 46,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
How much does the 1HVAC ACIQ-PHH1748000K000V cost to run per year?: At its rated efficiency it costs about $1,243-$3,459 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,551 in Phoenix and $2,905 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
What refrigerant does the 1HVAC ACIQ-PHH1748000K000V 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 $1,549/yrYou save $875/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 1HVAC ACIQ-PHH1748000K000V

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: $1,549
Current system, per year: $2,423
You save per year: $875
Payback: 20.0 years
Net after 10 years: -$8,753

Cooling $929Heating $619Electricity used: 9,680 kWhSaved vs. a minimum-efficiency heat pump: $310

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

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MRCOOL MDPH180484 · cold climate17.8 SEER2 · 8.5 HSPF2
Innovair TPV48H2XA · cold climate18.0 SEER2 · 8.8 HSPF2
Hisense AR-48U3R25U · cold climate17.0 SEER2 · 8.1 HSPF2
Daikin DHH0481********A16.8 SEER2 · 7.7 HSPF2
Carrier 50VR-K48---3015.5 SEER2 · 7.2 HSPF2
Tempstar PHR548000K***K115.5 SEER2 · 7.2 HSPF2
American Standard 5WCZ5048A115.2 SEER2 · 8.1 HSPF2

See all 17 4 ton packaged heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 29, 2026. How we use the data.