Heating, cooling and plumbing in Round Hill, where the Town water runs hard.
Round Hill’s Town water runs very hard, and a new tank water heater installed is $2,757 to $7,494. Here’s what that water does to homes in town and out.
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About 250 homes in the old town, and a ring of newer subdivisions on the same pipes.
Across the 20141 ZIP the Census puts the median owner home at 2004, and close to six in ten homes went up in 2000 or later. Inside the town limits it runs the other way: the Town’s own plan says most of its houses were built before the end of the 1920s.
The old town grew up as the end of the railroad line, from 1875 until the tracks pushed on to Bluemont in 1900, and summer boarders filled the houses along Loudoun Street, the old turnpike. The Chamblin boarding house at 1 East Loudoun dates to 1874. The Town piped in water in 1913, though plenty of families kept their own wells, encouraged septic tanks in 1926 and had sewer lines and a treatment plant by 1978. A house that old has had its plumbing redone a section at a time, so galvanized, copper and plastic can all turn up under one roof.
The subdivisions around it came fast. The Town’s plan says its utility grew very quickly from the mid 1990s to 2005, much of it the roughly 1,200-home project its developers built around the town, mostly detached houses on quarter to half acre lots. About nine in ten homes in 20141 are detached. A house from those years has had at least one water heater replaced by now, and plenty are on their second heat pump.
The heat is electric or propane. About half the owner homes in 20141 heat with electricity, usually through a heat pump, and four in ten burn propane from a tank on the property. Natural gas reaches about two homes in a hundred.
Scale in the water heater, propane furnaces, and heat pumps coming due.
SwiftPro’s heating and cooling technicians and its plumbers work as two separate teams, both based at our Chantilly shop.
Heating
With four in ten homes on propane, a Round Hill no-heat call is often a propane furnace: an igniter, a flame sensor or a gas valve, rarely anything a gas company owns. The tank and the fill belong to your propane supplier; the furnace and its venting are ours to fix or replace.
Cooling
Most homes here heat with electricity, so the outdoor unit is usually a heat pump working winter and summer. The subdivisions’ original units, put in around the turn of the century, are past the age most heat pumps last. When one quits, the HVAC estimator shows what a replacement runs before anyone visits.
Plumbing
The Town says its hard water leaves calcium in water heaters, makes toilets leak around the flapper and slows faucets. Each has a plain fix: a flush or a new tank, a flapper or fill valve, a faucet cartridge or aerator. Past the Town’s service area, a house on its own well still has the same water heater and drains inside, and those are ours too.
Round Hill pays our standard prices, inside the town line or out.
The Town charges out-of-town customers more for water. We don’t: the figure below is the same in town, in the Villages and on a farm lot, and you see it in writing first.
- AC run capacitor replaced$240 to $370
- Refrigerant topped up$190 to $740
- Condensate drain cleared$175 to $420
- Repair diagnostic visit$99
- Drain cleaning, one fixture$200 to $800
- Main sewer line cleaning$550 to $1,650
- Leak detection$200 to $500
- Pressure reducing valve replacement$500 to $1,000
- Water heater, tank, installed$2,757 to $7,494
These come from the price book behind our plumbing page and our AC repair page. For a new water heater, electric or propane, the water heater estimator gives your price with the Loudoun County permit counted.
Weighing a new heat pump or propane furnace? The HVAC estimator shows the installed range for a house your size before anybody comes out.
Town water and sewer well past the town line, Loudoun County for permits.
Your water
The Town of Round Hill pumps its water from wells in fractured bedrock, a dozen of them in its 2017 plan, and filters out iron and manganese at three treatment buildings before chlorinating it. It’s very hard: the hardness table in the Town’s 2025 water quality report runs from 115 to 317 milligrams per liter on the main system and reads 182 on the separate Stoneleigh system, roughly 7 to 18 grains per gallon. The USGS calls anything over 180 very hard.
Your permit office
Inside the town limits, the Town’s zoning permit comes first for new work such as an addition, a deck or a finished basement, and then Loudoun County’s Department of Building and Development issues the building permit. Anywhere in 20141, swapping a propane or gas water heater or furnace takes a County fuel gas permit; since October 1, 2025, one that keeps the same BTUs in the same spot needs no plans.
Permit pages: Loudoun County.
Your sewer, or your septic
On Town sewer, the Town owns the main and generally the line out to your property line; the stretch from there to the house was laid by your builder and is yours to keep up. The Town asks for nothing down the toilet but toilet paper and what it’s meant for: no wipes, even the ‘flushable’ kind, and no grease. Past the Town’s service area, a house drains to its own septic system, which the Loudoun County Health Department oversees.
Sources: the Town’s customer handbook and the Town’s 2017 utility plan and its flushing guide and Loudoun County’s wells and septic page.
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Voted a Nextdoor Neighborhood Faves winner two years running: 2026 in 30 Northern Virginia neighborhoods, 2025 in Emerald Chase (Herndon) and Hunters Run (Chantilly).
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Our vans in Round Hill lately
In the last 30 days SwiftPro’s vans worked in Purcellville, Hamilton and Middleburg, the towns around Round Hill.
Round Hill is 18 miles from SwiftPro’s Ashburn shop, and the van that comes to you is coming from the last job, not from the shop. SwiftPro charges no distance fees anywhere it serves.
The town, the Villages and the rest of 20141.
In the town: Loudoun Street and Main Street, from the old boarding houses up to the station end of Main. On Town water outside it: the Villages of Round Hill, Mountain Valley, Fallswood, Greenwood Commons, Lake Point, Stoneleigh, Lake Ridge, West Shore Villages, The Bluffs, Brentwood Springs and Poplar Hill. Farther out: Airmont and the farm lots across the rest of the ZIP. Next door:
Round Hill questions.
I live in the Villages of Round Hill, outside the town limits. Is my water the Town’s?
Yes. The Town’s customer handbook lists the neighborhoods it serves beyond its limits, the Villages of Round Hill and Stoneleigh among about a dozen. Out-of-town customers pay a higher rate, which the Town says goes back to the in-town owners who carry the system’s debt. Your water is the same hard well water the town gets, so the same calcium shows up in your water heater.
Why is there white crust on my faucets, and why does my water heater rumble?
Calcium. Round Hill’s water comes from wells and tested between 115 and 317 milligrams per liter of hardness on the main system, and the Town says that calcium builds up in water heaters, toilets and faucets. In a tank it settles as scale on the bottom, and the rumble is water boiling under it when the burner or element fires. A yearly water heater flush clears the loose sediment; once the scale has set hard, SwiftPro will tell you straight whether a flush still helps or the tank is done.
My toilet keeps running and the Town bill jumped. What now?
Check the flapper: put a few drops of food coloring in the tank, wait 15 to 30 minutes, and if color shows up in the bowl, it’s leaking. The Town says a running toilet can waste up to 200 gallons a day and that hard water makes flappers leak; it will also help you look for a leak, and its leak policy can adjust a bill in some cases. A new flapper or fill valve is a small repair for our plumbers.
Do I need a permit to replace a propane water heater in Round Hill?
Yes, a Loudoun County fuel gas permit, inside the town limits or out; propane counts as fuel gas. Since October 1, 2025, a swap that keeps the same BTUs in the same spot needs no plans review, while moving it or going bigger does. If the old tank bursts, Virginia’s building code lets the new one go in first, with the application due by the end of the next working day. SwiftPro’s water heater estimator counts the permit in every price.
What does a heat pump repair cost in Round Hill?
Three common ones: a run capacitor is $240 to $370, a refrigerant top-up $190 to $740, and a blocked condensate drain cleared $175 to $420, from the same book we price by across Northern Virginia. With about half of Round Hill heating by electricity, the unit you fix in July is often the one that heats the house in January, so a weak one is worth catching before the cold.
In town, in the Villages or out past Airmont, call us.
Tell us whether you’re on Town water or your own well, and whether a heat pump or propane heats the house. We’ll say what’s typical for a home like yours, what it usually costs, and when we can be there.
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company serving Northern Virginia, including Round Hill, Purcellville, Leesburg and Ashburn. SwiftPro holds Virginia contractor license #2705192276, is a Trane Comfort Specialist, Rheem Pro Partner and Mitsubishi Diamond Contractor, holds 5.0 stars across 884 Google reviews, was voted a Nextdoor Neighborhood Faves winner two years running, for 2026 in 30 Northern Virginia neighborhoods and for 2025 in Emerald Chase (Herndon) and Hunters Run (Chantilly), and is listed in both the HVAC and Plumbing categories of Northern Virginia Magazine’s Best Home Experts directory. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team. More at goswiftpro.com.
In Round Hill, SwiftPro repairs and replaces heat pumps, propane furnaces, air conditioners and ductless mini-splits, cleans air ducts and dryer vents, and handles plumbing from running toilets and drains to water heaters and sewer lines, in the town, in the Villages and across the rest of 20141.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Every town we serve is on the town-by-town guide.