TOSOT TW18HP32A2DO
ductless mini-split heat pump · ~1.5 ton (18,000 BTU/h cooling) · indoor unit TW18HCL32A5DI
A ductless mini-split heat pump that still moves 1.9× more heat than the power it draws at 5°F.
Buy this system
$1,599.00 at Amazon
TOSOT 18,000 BTU 24.5 SEER2, Mini-Split Air Conditioner & Heater, Energy Star & Cold Climate Certified, Ductless Inverter AC Unit with WiFi, Supports ERV System
Buy at Amazon →Affiliate link. We may earn a commission — it never changes your price or our specs.
At a glance
Who it's for
Homes in cold climates that want to heat with a heat pump instead of gas or oil.
The standout number
COP 1.9 at 5°F — it keeps working efficiently when it's frigid.
The catch
A DIY-listed unit still needs a licensed pro for the refrigerant hookup, permit and warranty.
The Verified Label — every certified spec
certified 2025-02-17
status: Active
Efficiency ratings — source: AHRI / ENERGY STAR
Capacity & the cold-climate truth — source: AHRI
Operating cost — computed by Verified HVAC Data
Heating cost
per MMBtu of delivered heat, at U.S. average electricity prices
Vs. electric resistance
cheaper to run than baseboard / strip heat ($55.19/MMBtu)
Computed from this unit's HSPF2 × EIA U.S. average electricity price. Your local price changes the answer — run it with your rates →
Refrigerant, staging & identity
How it ranks
Where this unit sits among the 12,239 heat pumps we track, on the two numbers that decide a heat pump. Percentiles are computed from our corpus (higher = better).
COP at 5°F
Better than 32%
of the 11,972 units with a published COP at 5°F
HSPF2
Better than 31%
of the 11,928 units with a published HSPF2
Rebates & incentives
This unit meets ENERGY STAR Most Efficient — the tier many state and utility heat-pump rebates require. The federal 25C tax credit expired on December 31, 2025; the live money now is state and utility programs plus HEEHRA. Check what applies where you live on our rebates page.
Compare similar heat pumps
Frequently asked questions
Does the TOSOT TW18HP32A2DO still heat in cold weather?
At 5°F it runs at a COP of 1.9, meaning it delivers 1.9 units of heat for every unit of electricity it uses. Its certified heating output at 5°F is 14,600 BTU per hour. It carries the ENERGY STAR Cold Climate designation.
What does the TOSOT TW18HP32A2DO cost to run?
About $20.92 per MMBtu of delivered heat at the U.S. average electricity price, roughly 62% less than electric resistance heat. Your local electricity price changes the number — use our operating-cost calculator to run it with your rate.
What refrigerant does the TOSOT TW18HP32A2DO use?
R-32, which has a global-warming potential (GWP) of about 675. This is one of the lower-GWP refrigerants replacing R-410A.
Where can I buy the TOSOT TW18HP32A2DO?
It's listed for sale online at Amazon for about $1,599. A licensed pro should still handle the refrigerant hookup, permit and warranty.
Sources. Performance ratings from the AHRI Directory (cited by reference number 215399273; not a verbatim mirror) and ENERGY STAR certification data. Operating-cost ($/MMBtu), savings and percentile figures are computed by Verified HVAC Data from published ratings and EIA U.S. average energy prices — see our methodology. Refrigerant GWP is the IPCC value for that refrigerant. We publish no star ratings and take no payment for placement. "Not published" means the source registry doesn't disclose it — we never fill a spec with a guess.
Calculate cost at your energy prices → Back to the product database