Thermostats: warranties compared
5 brands. We read every warranty so you don't have to. Checked through October 2026.
4 of 5 brands cover thermostats in full for one year or less. The longest full coverage is 3 years, from ecobee. 4 brands keep some parts covered after full coverage ends.
Every brand, side by side
- 1ecobee43/100Full: 3 yearsNo partial coverageVaries by model lineCheck your model's manual
- 2Emerson Sensi23/100Full: NonePartial: to 5 yearsPartial covers: Whole product (Pro models, contractor-installed); Whole product (DIY models)
- 3Mysa23/100Full: NonePartial: to 5 yearsPartial covers: Whole thermostat
- 4Honeywell Home15/100Full: NonePartial: to 2 yearsPartial covers: Whole thermostat (excl. battery)
- 5Amazon13/100Full: NonePartial: to 1 yearPartial covers: Whole productUnverified
From each maker's published warranty. “Unverified” means we couldn't confirm the terms on the maker's own site. How we rate warranties
What these warranties often leave out
- Accidental breaks and misuse2 of 5 brands
- Normal wear and tear2 of 5 brands
- Stopping working from outside causes2 of 5 brands
- Water damage2 of 5 brands
- Cracks1 of 5 brands
How long stores give you to return it
Longest return window first, for thermostats.
- CostcoMost itemsNo fixed deadline
- SupplyHouseMost items365 days
- Lowe'sMost items90 days
- The Home DepotMost items90 days
- WalmartMost items90 days
- CrutchfieldMost items60 days
Show all 10 stores
- Ace HardwareMost items30 days
- Do it BestMost items30 days
- FergusonMost items30 days
- Best BuyMost items15 days from delivery
From each store's published return policy, using its rule for thermostats where it has one. Member and holiday extensions aren't counted. Check yours before you buy.
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Questions shoppers ask
Which brand of thermostats has the best warranty?
On paper, ecobee scores highest, with 3 years of full coverage.
Is a long warranty on thermostats really that long?
Often not for the whole product. Many longer warranties cover only certain parts after the first year or two, and you usually pay for the labor. The bars above show full and partial coverage separately.
Do I need to register to get the warranty?
None of the 5 brands require registration for their basic coverage. Registering can still get you recall notices. Keep your receipt either way.
Forward the receipt and I-BUY.AI tracks the return window and warranty for you.