Service guide
Smart thermostat installation
Most installs are simple. The ones that go wrong are usually about compatibility and wiring.
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Written by HYRE HVAC Research Desk Primary-source research, data analysis and fact checking
The short version
Safety first: line voltage
This part sits in a high-voltage circuit.
Capacitors can still hold a charge after the power is off.
A wrong wire or the wrong part can burn out the new motor or start a fire.
Check these before you buy
Gas furnace, heat pump, dual fuel, boiler or electric baseboard.
Without one, some thermostats lose power.
Electric baseboard thermostats often run on line voltage. Most smart thermostats cannot connect to them.
What a careful installation includes
So backup heat is not used too much.
When to have a contractor do it
Call a contractor when there is no C wire and a new wire must be run, when the system is a heat pump or dual fuel, when the old thermostat is line voltage, or when the wiring does not match the labels.
A miswired heat pump thermostat can run expensive backup heat all winter. For a broken thermostat, see thermostat repair. Our thermostat savings calculator estimates setback savings.
What drives the price of smart thermostat installation
HyreHVAC does not publish a price for smart thermostat installation. We do not yet hold enough sourced, dated quotes to give a figure we can stand behind.
The thermostat model, whether a new wire is needed, and the system type are the main drivers. Our HVAC cost guides explain each driver, and the thermostat savings calculator lets you work through your own numbers.
What happens after you ask
You fill in the HVAC options form with the job and your zip code. HyreHVAC is a publisher, not a contractor, and contractor matching is still being built. Until it is, treat the form as an inquiry. Keep getting your own written quotes and check each contractor’s licence with your state board.
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Tell us about the work
Three short steps: the job, your home, and how to reach you. Nothing goes to an HVAC company unless you agree.
A person reads it and replies, free and with no obligation. Matching is not live yet, so this is not a quote. If you smell gas or a CO alarm sounds, leave the house and call 911 or your gas utility first.
Get HVAC Options
A person at HyreHVAC reads the request and replies. Matching with contractors is not live yet, so this is not a quote.
Questions
Do I need a C wire?
Can I install a smart thermostat myself?
Will it work with my heat pump?
Do smart thermostats save energy?
Written and audited by
HYRE HVAC Research Desk
Primary-source research, data analysis and fact checking
We are a research desk, not a sales floor. We read the federal microdata file, the statute or the manufacturer data sheet ourselves, and we publish the figure with the document it came from and the date we retrieved it.
Where a number cannot be traced to a primary source, we publish the shorter page and say what we could not verify.
The counts below are generated from the published pages themselves, last counted October 26, 2026, and they are what we have actually published rather than what we intend to.
- 18
- studies published
- 15
- federal sources read and cited
- 15
- studies published with their full dataset as CSV
- 51
- jurisdictions reproduced against EIA’s own tables
How this desk works
- Primary sources only. Federal data comes from the agency that collects it, in the file that agency publishes. We do not cite an article that cites a source; we download the source and compute the figure ourselves.
- We validate against the agency before we publish. First, we use each federal microdata file to reproduce the agency’s own published tables. Our cooling research reproduces EIA’s state estimates and standard errors for all 51 jurisdictions. That check caught a variance formula that was off by a factor of four.
- Every estimate carries its uncertainty. These are survey figures, not counts. Standard errors are computed from the replicate weights the federal file supplies and printed beside the estimate. An estimate too imprecise to publish is reported as such rather than printed.
- Nothing is typed by hand. Prose, tables and charts all read from one dataset built by script, so a number in a sentence and the same number in the table below it cannot disagree.
- We publish the data, not just the conclusion. 15 of our 18 studies offer the full computed table as a CSV download on the page, so you can check the analysis or disagree with it. A study without a row-level dataset gets no download link and claims none in its structured data.
- We correct in public. Where we have published a figure wrongly we fix the figure, rewrite any analysis that rested on it rather than patching the number underneath it, and leave a dated correction note on the page.
- We do not install or sell HVAC equipment, and we take no payment for placement, ranking or a favorable mention. Nobody buys a position on this site.
Data as of Sources checked October 26, 2026. Authorship on this site is organizational: the analysis belongs to the desk rather than to a named individual, and we do not publish credentials we do not hold. Our editorial policy sets out how we source, date and correct what we publish.
Sources & retrieval dates
HyreHVAC is a publisher. We do not install, repair or inspect HVAC equipment and hold no contractor licence. Nothing here replaces an on-site diagnosis by a licensed contractor. Sources are cited with the date they were checked.