What Size Furnace Do I Need for a Minnesota House?
Furnace size comes from a Manual J heat loss at a -15°F design day, not square feet. Input vs output BTU, AFUE, why old furnaces run big and what to ask for.
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Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in Wayzata (Hennepin County), about 12 miles from downtown Minneapolis.
Wayzata sits at the northeast tip of Lake Minnetonka, where the 1906 Great Northern depot and the Lake Street shops face Wayzata Bay and the Ferndale shore is lined with old estate homes.
Updated October 27, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: Lake Minnetonka · Wayzata Bay · Great Northern Depot · Lake Street · Dakota Rail Regional Trail. Neighborhoods: Ferndale · Holdridge
Book in WayzataWayzata's oldest homes date to its railroad and resort years, when the rail line along the shore brought summer visitors out from Minneapolis. Estate homes along Ferndale Road and Bushaway Road were built facing the lake with steam or hot-water boilers, and many have been renovated so often that one basement holds three generations of equipment: an old boiler room, a newer high-efficiency boiler and separate air handlers added for cooling.
Closer to downtown, much of the recent building has been multifamily: condominiums and apartment buildings along Lake Street and near the bay, where a unit may have its own small furnace or fan coil and a condenser on a roof or balcony. Up the hill, the postwar ramblers and 1960s split-levels near Highway 12 are typical suburban stock, with basement furnaces and central air added later onto ducts that were sized for heat alone. Each of those three groups needs a different kind of service visit.
Wayzata Bay freezes into a wide, open plain, and homes and condo buildings on the shore take its wind. Estate homes with boilers need circulator pumps, zone valves and expansion tanks checked before winter, because a failed pump leaves a whole zone cold within hours. In condo buildings, a unit furnace can shut down when its balcony or roof vent frosts over. Older cottages near downtown lose heat through thin walls and single-pane windows, and their small furnaces run nearly nonstop in a cold snap.
Lakeside condos and houses face the bay's afternoon sun and humidity, so their cooling works hardest late in the day, and lower levels near the water stay damp. Older estate homes often cool with air handlers in the attic, where summer heat bakes the ductwork and a clogged condensate line can overflow the pan. A float switch that shuts the unit off before water reaches the ceiling is cheap insurance. Up the hill, ramblers with central air added later often run short on return air.
Wayzata is on CenterPoint Energy gas and Xcel Energy electricity. CenterPoint's heating rebates cover high-efficiency boilers as well as furnaces, useful for the estate homes and older houses on hot-water heat, and you can use your own dealer. Xcel's rebates cover central AC, heat pumps and mini-splits, often through a registered contractor, so ask first. In condo buildings, check with the association before counting on a rebate, since some equipment is owned in common.
Rebate programs change every year; check the utility's current terms before you buy. Our guides: Xcel and CenterPoint rebates, heat pump rebates, what happened to the federal credits.
Central Minnesota Heating and Cooling, owned by Eric Brown and in business since 2009, serves Wayzata and nearby towns in Hennepin County, about 12 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 Wayzata 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.
Yes. The 55391 ZIP code covers far more ground than the city of Wayzata, including several neighboring Lake Minnetonka communities, and we serve all of them at the same flat pricing. What changes is the permit: it comes from the city your house actually sits in, not the one printed on your mail, so check the property record to confirm the right city.
Yes. In many older estate homes the boiler and the cooling system each have their own thermostats, and in spring and fall they can end up working against each other. We can tie them to one control setup so heating and cooling can't run at the same time in the same area, and add zones so closed-off rooms aren't heated or cooled for nothing.
Usually, within limits. The closet sets the cabinet size, and the building decides where a high-efficiency furnace can vent and where the condenser sits. Some buildings use a different setup entirely, such as fan coils on a central boiler or through-wall heat pumps. We look at the closet, the vent path and the association's rules, then quote equipment that fits all three.
Attic units sit over finished rooms, so the drain setup matters. Most need a secondary pan under the unit and a float switch that shuts the system off if water backs up. We clear the primary condensate line, check its slope, confirm the pan and switch work, and look for rust in the pan. A yearly check before cooling season catches a slow clog before it becomes a ceiling stain.
In cold weather, roughly 25 to 35 percent indoors, and lower in deep cold. Wind off the frozen bay chills glass fast, so a setting that is comfortable in November fogs and frosts windows in January. If your humidifier mounts on the furnace, turn it down as the outdoor temperature drops. We can check the humidistat and the water panel during a heating tune-up.
Furnace size comes from a Manual J heat loss at a -15°F design day, not square feet. Input vs output BTU, AFUE, why old furnaces run big and what to ask for.
Read the guideA communicating HVAC system links thermostat, furnace and outdoor unit by data. The features it adds, the lock-in, and when it pays off in Minnesota homes.
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Read the guideBrands we service in Wayzata: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Wayzata? Call or send a request.