What is the SEER2 rating of the Thermal Zone TZID30H520ZCS?

The Thermal Zone TZID30H520ZCS is rated at up to 17.1 SEER2 and 11.0 EER2 for cooling and up to 8.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 15 certified matchups SEER2 ranges from 15.2-17.1.

Is the Thermal Zone TZID30H520ZCS 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 2.5-ton model.

How much does the Thermal Zone TZID30H520ZCS cost to run per year?

At its rated efficiency it costs about $798-$2,171 a year in electricity in large U.S. cities, depending on climate and local rates - for example $989 in Phoenix and $1,818 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 Thermal Zone TZID30H520ZCS?

ENERGY STAR lists 15 certified combinations for this outdoor unit. The highest-rated one uses TZID36H520ZACC.

2.5-ton central heat pump · TZ Series

Thermal Zone TZID30H520ZCS

Average cooling efficiency and below average heating efficiency for a 2.5-ton central heat pump, but not rated for cold climates.

Ranks #81 of 199 2.5 ton central heat pumps for cooling efficiency, and costs about $905 a year to run in a mixed climate like Atlanta.

SEER2: 17.1 Cooling efficiency over a season
Average · beats 53%
HSPF2: 8.4 Heating efficiency over a season
Below average · beats 31%
EER2: 11.0 Cooling efficiency on a 95°F day
Below average · beats 23%
Heat at 5°F: 19,000 BTU/h62% of its 47°F output
Below average · beats 20%

A good fit if…

You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 15 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

Specifications2.5 ton, R-454B

General
Brand	Thermal Zone
Outdoor unit model	TZID30H520ZCS
Series	TZ Series
Type	Central heat pump
Nominal size	2.5 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	January 30, 2026
Last certified	March 9, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.1 (range 15.2-17.1)
EER2Efficiency at 95°F outdoors	11.0-11.2
Cooling capacity	29,000-30,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.2-8.4
Capacity at 47°F	29,000 BTU/h
Capacity at 17°F	17,000-18,000 BTU/h
Capacity at 5°F	18,000-19,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-1.90
ENERGY STAR cold climate	No

Heating output as it gets colder62% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with TZID36H520ZACC at the standard test temperatures, in BTU/h:

Certified matchups15 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.
TZID36H520ZACC	S9V2C100U5VS***	17.1	11.0	8.3	18,000	218079745
TZID36H520ZACC	S9V2C100D5VS***	17.1	11.0	8.3	18,000	218079744
TZID36H520ZACC	RL18100C16MPS1	16.3	11.2	8.3	18,000	218079842
TZID36H520ZACC	MGV96U080C4C	16.2	11.0	8.4	19,000	218079691
TZID36H520ZACC	RG19100C20MPS1	16.2	11.1	8.3	19,000	218079824
TZID36H520ZACC	RL18080C16MPS1	16.0	11.0	8.2	18,000	218079841
TZID36H520ZACC	ML193UH110XE48C*	15.9	11.1	8.3	18,000	218079991
TZID36H520ZACC	ML193UH110XE48B*	15.9	11.1	8.3	18,000	218079964
TZID36H520ZACC	RL18100C20MPS1	15.7	11.2	8.2	18,000	218079843
TZID36H520ZACC	ML196DF090XE48C*	15.6	11.0	8.2	18,000	218079992
TZID36H520ZACC	ML193DF090XE48C*	15.6	11.0	8.2	18,000	218079989
TZID36H520ZACC	ML196DF090XE48B*	15.6	11.0	8.2	18,000	218079965
TZID36H520ZACC	ML193DF090XE48B*	15.6	11.0	8.2	18,000	218079963
TZID36H520ZACC	RG19100C16MPS1	15.5	11.1	8.2	19,000	218079823
TZID36H520ZACC	ML296UH110XV60C*	15.2	11.1	8.2	18,000	218079966

Yearly running cost in 10 large cities$798-$2,171

Phoenix, AZ$989/yr
Miami, FL$798/yr
Houston, TX$886/yr
Atlanta, GA$905/yr
Los Angeles, CA$882/yr
New York, NY$2,171/yr
Chicago, IL$1,765/yr
Denver, CO$1,469/yr
Seattle, WA$904/yr
Minneapolis, MN$1,818/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 Thermal Zone TZID30H520ZCS?: The Thermal Zone TZID30H520ZCS is rated at up to 17.1 SEER2 and 11.0 EER2 for cooling and up to 8.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 15 certified matchups SEER2 ranges from 15.2-17.1.
Is the Thermal Zone TZID30H520ZCS 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 2.5-ton model.
How much does the Thermal Zone TZID30H520ZCS cost to run per year?: At its rated efficiency it costs about $798-$2,171 a year in electricity in large U.S. cities, depending on climate and local rates - for example $989 in Phoenix and $1,818 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 Thermal Zone TZID30H520ZCS?: ENERGY STAR lists 15 certified combinations for this outdoor unit. The highest-rated one uses TZID36H520ZACC.
What refrigerant does the Thermal Zone TZID30H520ZCS 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 $984/yrYou save $512/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 Thermal Zone TZID30H520ZCS

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: $984
Current system, per year: $1,495
You save per year: $512
Payback: 21.5 years
Net after 10 years: -$5,883

Cooling $597Heating $387Electricity used: 6,148 kWhSaved vs. a minimum-efficiency heat pump: $163

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 2.5 ton models

NOVAIR LEA30CEN36-O · cold climate17.2 SEER2 · 10.8 HSPF2
Panasonic CU-M30BAHU17.1 SEER2 · 8.3 HSPF2
MRCOOL UHP18030-O · cold climate17.2 SEER2 · 10.8 HSPF2
TCL H30TDHXPC · cold climate17.0 SEER2 · 9.5 HSPF2
Breeze33 BZ33-INV30OUT2-454-G3-J · cold climate17.2 SEER2 · 10.8 HSPF2
Airquest D5CUHAH30AAK+KSAIC0701230 · cold climate17.0 SEER2 · 9.0 HSPF2
Blueridge BNG3A30UCN · cold climate17.2 SEER2 · 10.8 HSPF2
Carrier 37MUHAQ30AA3+KSAIC0701230 · cold climate17.0 SEER2 · 9.0 HSPF2

See all 199 2.5 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 9, 2026. How we use the data.