What a Boiler Expansion Tank Does and Signs It's Failing
A boiler expansion tank absorbs water that swells as it heats. How it works, what the pressure gauge tells you, and why a dripping relief valve is the clue.
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Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in Farmington (Dakota County), about 24 miles from downtown Minneapolis.
Farmington stayed a small Vermillion River farm town until the 1990s, then grew several times over as subdivisions spread around the old downtown.
Electricity in Farmington comes from Dakota Electric Association or Xcel Energy depending on where you live.
Updated October 27, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: Dakota County Fairgrounds · Vermillion River · Downtown Farmington · Rambling River Park · Minnesota Highway 3
Book in FarmingtonFarmington's old town grew along the Vermillion River, and the blocks within walking distance of downtown still hold frame houses from the late 1800s and early 1900s, plus ramblers from the 1950s and 1960s built as the town slowly filled in. In the older houses, ductwork weaves through low basements with heavy beams and a chimney in the middle, and upstairs rooms were an afterthought for heat, often fed by one or two small runs.
Then the town took off. Farmington's population more than tripled between 1990 and 2010, and those subdivisions share a pattern: a builder-grade furnace in an unfinished corner of the basement, a condenser in the side yard, a single return on each floor and a thermostat in the main-floor hallway. The late-1990s houses are now past 25 years old and the 2000s ones are close behind, the age when inducer motors, capacitors and control boards start to fail.
Farmington's newer neighborhoods went up on flat, open farmland, and wind across the fields drifts snow over side-wall PVC vents and piles it against heat pumps. The Vermillion River valley through the old town holds cold air on still nights, and older houses there with thin walls and old windows feel it first. Farms and acreage outside town depend on propane deliveries along rural roads that drift shut, so keep a clear path to the tank before January.
Open land means full sun on the newer two-stories, and their upstairs bedrooms run warm on July afternoons when a single hallway return can't pull the heat back. The Vermillion River corridor adds humidity and cottonwood fluff near downtown. Original builder air conditioners from the late 1990s may still use R-22, which is no longer produced, so a leak on one of those usually starts a replacement conversation rather than a recharge.
Farmington's gas utility is Minnesota Energy Resources, not CenterPoint, and it runs its own rebates for high-efficiency furnaces, boilers and thermostats, plus a heating tune-up rebate, which has to be done by a professional heating technician rather than the homeowner, with the application due within 60 days of the service. Dakota Electric's Energy Wise Rebates cover heat pumps, ductless systems and AC tune-ups, and its quality-installation rebates need a registered contractor. Xcel customers use Xcel's heat pump and cooling rebates; ask whether the rebate needs a registered contractor.
Rebate programs change every year; check the utility's current terms before you buy. Our guides: heat pump rebates, what happened to the federal credits.
Central Minnesota Heating and Cooling, owned by Eric Brown and in business since 2009, serves Farmington and nearby towns in Dakota County, about 24 miles from downtown Minneapolis. We're open 7 days, 7am–9pm, and no-heat calls get priority. Call 612-429-3465.
An HVAC service call in Farmington is a flat $79 trip charge, waived when you approve the repair. You get a written price before any work. Installed prices are on our pricing page.
Only the paperwork. Minnesota Energy Resources delivers natural gas in Farmington and offers its own rebates on qualifying furnaces and boilers, separate from CenterPoint's and Xcel's. The equipment and installation are the same. Program rules and amounts change yearly, so we check the current requirements when we quote a high-efficiency furnace and help you file after the install.
There's no fixed age. A furnace that runs clean, holds its temperature rise and passes a heat exchanger inspection can keep going. The signals to start planning are repairs stacking up, a failed inducer or control board on an older unit, or rooms that never feel right. When a repair comes up, we write prices for both the repair and a replacement so you can compare them side by side.
Being on Dakota Electric can help. Dakota Electric offers rebates on air-source and ductless heat pumps and a rebate for first-time dual-fuel program enrollment, and its quality-installation rebates require a registered contractor who files the application, so ask about that up front. The gas side runs through Minnesota Energy Resources. With two separate programs involved, we lay out what each covers before you choose equipment.
Yes. Farms and acreage around Farmington get the same pricing and scheduling as homes in town. The equipment differs: propane furnaces, sometimes a boiler, and outbuildings with unit heaters. Before a replacement, we check whether natural gas reaches your road, since switching fuels changes both the furnace setup and the rebates that apply.
A boiler expansion tank absorbs water that swells as it heats. How it works, what the pressure gauge tells you, and why a dripping relief valve is the clue.
Read the guideSEER2 replaced SEER on January 1, 2023 under a tougher DOE test, so numbers read lower. How it's measured, Minnesota's 13.4 minimum and what to buy.
Read the guideThe best location for a thermostat: an interior wall in a central, lived-in room about 5 feet up. Plus the 7 spots that read wrong and a simple test.
Read the guideBrands we service in Farmington: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Farmington? Call or send a request.