How much does an HVAC company charge to install a thermostat in Virginia?

Each company sets its own price for thermostat installation. What you pay is the company's visit or trip fee, its labour, and the thermostat if it supplies one. The useful question is which of those your job adds to, and that you can mostly work out before anyone arrives.

What drives the price

A straight swap. Your old thermostat is a standard low-voltage model, the new one is compatible, and the wires reach. This is the short end of the range: the technician moves the wires, sets the system type and tests heating and cooling.

No C wire. Some smart thermostats need a common (C) wire for power. A technician first looks for a spare wire tucked into the wall or wound around the bundle.^[2] If there is none, there are two ways to go. An adapter such as ecobee's Power Extender Kit fits at the furnace control board and works by combining the jobs of the Y and G wires into one wire to free up a wire for the C connection,^[3] though it "only works with 24 VAC systems."^[3] Or a new cable is run from the furnace to the thermostat, and as Google's help puts it, "Costs can vary depending on how difficult it is to route a new wire through your walls."^[1]

A harder system. Google recommends professional installation for dual fuel systems (a heat pump with a furnace), dual transformer systems with more than one R wire, and whole-home humidifiers and dehumidifiers.^[1] These take longer to wire and set up, and you should expect that in the quote.

Line voltage. High-voltage thermostats are usually found on electric baseboard heat,^[1] and swapping one is electrical work. To make such a system take a smart thermostat, Google's advice is to "Contact a local professional and have them install a step down transformer to 20 - 30 V."^[1] Expect that to be priced as an electrical job.

The thermostat itself. If the company supplies it, it sets the price. If you supply it, ask whether the company will install it. For a sense of hardware cost, when we checked on October 26, 2026, ecobee listed its Power Extender Kit at $24.99 and its Smart Thermostat Essential at $139.99^[3] on its own store.

What should not be on the bill

A permit fee for a standard thermostat. Under Virginia's building code, no permit is needed for wiring and equipment that operates at less than 50 volts,^[7] unless the wiring runs in a plenum, goes through fire-rated construction or is part of a fire alarm or similar safety system. If a quote includes a permit for a plain low-voltage swap, ask why.

An unlicensed installer. Virginia requires a tradesman licence for anyone who does electrical, plumbing or HVAC work for the general public for pay.^[8][9] Check any business on DPOR's licence search^[10] before you book.

Rebates that offset the cost

Your electric utility may pay part of the bill for an ENERGY STAR certified smart thermostat.

• Dominion Energy Virginia: when we checked on October 27, 2026, Dominion Energy's smart thermostat rebate page listed up to $50 per unit for ENERGY STAR certified thermostats bought after January 1, 2025.^[4] On that day its after-purchase rebate application was marked Out Of Stock and the Apply for Rebate button was disabled,^[4] so that route looked paused. The page also names two other routes, an instant rebate on Dominion's online marketplace and a retailer coupon, which count toward the same two-thermostat limit.^[4] The other conditions on that page: the home must have a heat pump (air source, ductless mini-split or geothermal), the customer must live in a single-family home, and the application is due no later than 90 days after purchase.^[4]
• Appalachian Power: when we checked on October 26, 2026, its Bring Your Own Thermostat program offered a $50 pre-paid debit card for enrolling a Wi-Fi smart thermostat that controls central air conditioning, plus up to $25 a year^[5] for letting the utility make small adjustments on peak-demand days.

Programs change and can pause, so check that the offer is open on the utility's page on the day you buy, and keep the receipt.

Is a new thermostat worth it?

It can pay back over time if you use the schedule. The Virginia Energy Savers Handbook, in its third edition, revised in 2005,^[6] said "Programmable thermostats can save as much as 10% on your heating and cooling bill"^[6] by setting back the temperature while the house is empty or everyone is asleep. It made an exception for heat pumps: they may fall back on supplemental resistance heat to recover from a setback,^[6] so it saw little gain in setting one back by hand unless it can stay set back for 24 hours or more.^[6] It also noted that a few programmable thermostats are made for heat pumps and start them early instead.^[6]

Stop and call a pro if

Plenty of homeowners do the swap themselves; how to replace a thermostat walks through it, and whether you need a licence covers the legal side. Pay for the visit instead if:

• the old thermostat is 120 or 240 volts, with thick wires and wire nuts;
• the new one needs a C wire and there is no spare at the wall;
• you have a heat pump with a furnace, two transformers or a whole-home humidifier;
• the wires are stranded, or the terminals have numbers or odd letters instead of the usual R, W, Y, G, C;
• you smell gas or burning at any point, in which case leave the thermostat and call your gas company or an HVAC technician;
• the system will not run properly after a swap, which why a new thermostat is not working helps narrow down.

Getting quotes

Loclis lists DPOR-licensed HVAC businesses with licence number and class. Browse HVAC businesses in Blacksburg, thermostat installation or all heating and cooling answers. Ask each business for a written quote that lists the visit fee, labour and parts separately.

Describe your thermostat job once and licensed local HVAC businesses quote it.