What is the SEER2 rating of the DETTSON MHD-18?

The DETTSON MHD-18 is rated at up to 15.2 SEER2 and 11.7 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the DETTSON MHD-18 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 14,600 BTU/h at 5°F with a COP of 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.

How much does the DETTSON MHD-18 cost to run per year?

At its rated efficiency it costs about $542-$1,333 a year in electricity in large U.S. cities, depending on climate and local rates - for example $663 in Phoenix and $1,098 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 DETTSON MHD-18?

ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated one uses MHD-CC2.0-17.5-M.

What refrigerant does the DETTSON MHD-18 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.

1.5-ton central heat pump · MHD series

DETTSON MHD-18

Below average cooling efficiency and very good heating efficiency for a 1.5-ton central heat pump, and certified for cold climates.

Ranks #148 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $572 a year to run in a mixed climate like Atlanta.

SEER2: 15.2 Cooling efficiency over a season
Below average · beats 6%
HSPF2: 9.5 Heating efficiency over a season
Very good · beats 70%
EER2: 11.7 Cooling efficiency on a 95°F day
Average · beats 43%
Heat at 5°F: 14,600 BTU/h75% of its 47°F output
Very good · beats 76%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 14,600 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 70% of central heat pumps.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

Cooling cost matters most - its SEER2 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

Specifications1.5 ton, R-410A

General
Brand	DETTSON
Also sold as	Innovair
Outdoor unit model	MHD-18
Series	MHD series
Type	Central heat pump
Nominal size	1.5 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	October 15, 2022
Last certified	April 22, 2026
Cooling
SEER2Seasonal efficiency, higher is better	15.2 (range 15.2)
EER2Efficiency at 95°F outdoors	11.7
Cooling capacity	18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.5
Capacity at 47°F	19,500 BTU/h
Capacity at 17°F	13,000 BTU/h
Capacity at 5°F	14,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.20
ENERGY STAR cold climate	Yes

Heating output as it gets colder75% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MHD-CC2.0-17.5-M at the standard test temperatures, in BTU/h:

Certified matchups2 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.
MHD-CC2.0-17.5-M · cold climate	15.2	11.7	9.5	14,600	210365427
MHD-CC2.0-17.5-M · cold climate	15.2	11.7	9.5	14,600	210365429

Yearly running cost in 10 large cities$542-$1,333

Phoenix, AZ$663/yr
Miami, FL$554/yr
Houston, TX$593/yr
Atlanta, GA$572/yr
Los Angeles, CA$551/yr
New York, NY$1,333/yr
Chicago, IL$1,076/yr
Denver, CO$889/yr
Seattle, WA$542/yr
Minneapolis, MN$1,098/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 DETTSON MHD-18?: The DETTSON MHD-18 is rated at up to 15.2 SEER2 and 11.7 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the DETTSON MHD-18 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 14,600 BTU/h at 5°F with a COP of 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
How much does the DETTSON MHD-18 cost to run per year?: At its rated efficiency it costs about $542-$1,333 a year in electricity in large U.S. cities, depending on climate and local rates - for example $663 in Phoenix and $1,098 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 DETTSON MHD-18?: ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated one uses MHD-CC2.0-17.5-M.
What refrigerant does the DETTSON MHD-18 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 $647/yrYou save $306/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 DETTSON MHD-18

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: $647
Current system, per year: $953
You save per year: $306
Payback: 22.9 years
Net after 10 years: -$3,941

Cooling $417Heating $230Electricity used: 4,042 kWhSaved vs. a minimum-efficiency heat pump: $88

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 1.5 ton models

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Tempstar T5H6S18*K*AAA15.5 SEER2 · 8.0 HSPF2
TCL THH18HAI2NAF2U23 · cold climate15.2 SEER2 · 8.5 HSPF2
Heil N5H5S18*K*AAA15.5 SEER2 · 8.0 HSPF2
DuraSTAR DRHP15B18AJ2AN · cold climate15.2 SEER2 · 8.1 HSPF2
Heil H5H6S18*K*AAA15.5 SEER2 · 8.0 HSPF2
Mainline MLP15AY18AJ2N · cold climate15.2 SEER2 · 8.1 HSPF2

See all 170 1.5 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of April 22, 2026. How we use the data.