Open 24/7 for emergencies
Heat pump replacement in Hamilton runs $8,499 to $21,650 installed. Half the owner homes in 20158 run on electric heat, and that mostly means heat pumps.
Price range
$8,499-$21,650
8yrs @ 7.99%
$120/mo
15yrs @ 9.99%
$91/mo
Monthly figures on the starting price, the whole price financed, on approved credit. The lender sets the final terms. How financing works
Get your price in writing
Send this and the office calls or texts you back to set a time.
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Rather talk now? (703) 997-9757
5.0 stars across 1,132 reviews
One of our HVAC technicians with an electric heat strip kit, the backup heat inside a heat pump’s air handler.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, and we will tell you honestly when we can get there.
Our own HVAC installersA dedicated heating and cooling team, separate from our plumbers
Price in writing firstYou see every option priced before anything is ordered
What it costs
The same price book as our heating page and the HVAC estimator, for a heat pump and air handler, 2 to 5 ton.
A heat pump system, outdoor unit and air handler, installed
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
A gas furnace and air conditioner together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Diagnostic visit, when a repair may do
$99
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
Might it be a repair? The diagnostic visit is $99, and the tech prices the repair and the replacement side by side. Financing is available, subject to approval.
With Comfort+ membership at $199 a year, the diagnostic visit is included, and half of each repair bill is banked toward replacing that system, up to $1,500.
What’s different in Hamilton
The Census counts 665 of the ZIP’s 1,298 owner homes heating with electricity, and in a house built here from the 1970s on, that most often means a heat pump outside with resistance strips in the air handler. In many of the 373 propane homes a heat pump stands in front of the furnace, calling on it only when the cold gets serious. Either way, the outdoor unit works all twelve months.
The Purcellville weather station, 2.6 miles west-northwest of town, puts the median first freeze on October 25 and the last on April 16, with close to 115 nights at or below 32 degrees between. On those nights frost builds on the outdoor coil and the heat pump reverses for a few minutes to melt it. One that stops defrosting and ices solid usually has a failing sensor, board or refrigerant charge, and past fifteen winters that repair often tips it to replacement.
Then the deep cold: about five nights a year at 10 degrees or below at that station, and a subzero night every other year. It logged 5 below on its February 24, 2015 reading, its lowest since 2000, and on January 23, 2025, a station in Hamilton read the same, unofficially. A current variable-speed heat pump keeps heating well into the teens; below that, the strips or the propane furnace carry part of the load.
Big snows decide where the outdoor unit sits. A spotter measured 18 inches in Hamilton in the December 2009 storm, and in February 2010 the Purcellville station had 39 inches on the ground and Loudoun County had outages throughout. A raised stand keeps the coil above drifts. In an all-electric house an outage takes the heat pump and the strips together, so size any generator before choosing the system.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise. A heat pump counts as electric heat.
ZIP 20158 as a whole: every Hamilton address, the Town and the countryside around it. The Census place for the Town alone has too few homes for steady figures.
When it’s time
If the auxiliary heat light stays on for hours and the vents blow warm only while it’s lit, the strips are doing the heat pump’s work. That’s often low refrigerant or a weak compressor, and a $99 diagnostic visit tells you which.
When the heat pump can’t keep up, the electric strips take over, and they cost far more to run. Aux heat on for hours is the sign.
A heat pump from a 2000s house that’s still original has run every summer and winter since. Once repairs start, price the replacement before the next one.
Choosing who installs it
Questions to ask anybody who quotes you, us included.
That’s the outdoor temperature where the heat pump alone stops keeping up and the backup joins in. It should come from a load calculation on your house, and the quote should name it and what covers the house below it.
Copying the old nameplate repeats whatever guess was made when the house was built. The wrong size runs worse in both seasons.
A heat pump system is the outdoor unit plus the air handler inside. Ask whether the quote covers both, matched, in writing.
Set wrong, the electric strips run on mild days. Ask who programs the thermostat and at what outdoor temperature the strips may come on.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
Ndung and Oscar were great. Everything went smoothly, and after the install they made sure to show me everything I needed to know about the new unit.
Where we work
Next door to Hamilton: Paeonian Springs, Waterford, Purcellville, Leesburg and Lovettsville.
Questions
Most of the winter, yes. The Purcellville station’s January low averages 24.5 degrees, and a properly sized current heat pump heats well at that. On the few nights near or below 10 the backup helps, and where the house already has propane, that furnace is a common backup.
Brush the snow off the top and away from the sides, never a shovel blade against the fins. If it’s iced solid or grinding, switch the thermostat to emergency heat and call us to look at it before it runs again.
$8,499 to $21,650 installed for a heat pump system, the outdoor unit and the air handler, 2 to 5 ton. A small single-stage system lands near the bottom, a big variable-speed one near the top. The HVAC estimator narrows it to your house.
A heat pump system runs $8,499 to $21,650 installed; a gas furnace and air conditioner together, $8,898 to $23,000. No gas line usually means a heat pump. With gas, you can keep the furnace and add one; our heat pump vs gas furnace guide runs the numbers.
Ready when you are
Call, or send the form at the top. The price is in writing before the old unit comes out, and if a repair makes more sense, you’ll hear that first.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Hamilton and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.