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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Heating & Cooling in Deephaven, MN
Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in Deephaven (Hennepin County), about 14 miles from downtown Minneapolis.
HVAC service in Deephaven, MN
Deephaven began as a Lake Minnetonka summer colony of estates and a 150-room hotel, and today about 1,500 homes share 2.3 square miles of land along Carson's Bay and the main lake.
- County
- Hennepin County
- ZIP codes
- 55331, 55391
- Natural gas
- CenterPoint Energy
- Electric
- Xcel Energy
- From downtown Minneapolis
- about 14 miles
Updated October 27, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling
What HVAC work do we do most in Deephaven?
- Humidifier setup and descaling for homes on private well water
- Replacing furnaces and retrofit central air in the city's 1930s–1950s houses
- Dehumidification for lower levels close to the lake
- Airflow balancing and zoning for lake-facing rooms that lose heat in the wind
Around town: Lake Minnetonka · Carson's Bay · Thorpe Park · Minnetonka Boulevard · Lake Minnetonka Regional Trail. Neighborhoods: Cottagewood · Northome
Book in DeephavenWhat are Deephaven homes like to heat and cool?
Deephaven's lake history starts in 1876, when St. Louis attorney Charles Gibson began building a summer colony. His estate, Northome, went up in 1877, and the 150-room Hotel St. Louis opened on the shore in 1879 and came down in 1907. In 1900 residents voted to join Deephaven, Cottagewood, Northome and Summerville as one village, and by 1905 the Gibsons had sold nearly all their lakefront, partly on talk of trolley service, as summer places gave way to year-round homes. A house from those decades has almost certainly had its heating replaced more than once, and the result can be a patchwork: a boiler in one wing, ducts in another, electric heat in an addition.
The bigger building wave came between 1930 and 1960, when the population grew from 530 to 3,286. Those houses usually began with a single basement furnace sharing a chimney flue with the water heater, ducts sized only for heat, and air conditioning added decades later. Several furnace replacements on, their ducts and returns deserve as much attention as whatever equipment goes in next.
What goes wrong with heating in Deephaven in winter?
With so much shoreline, many Deephaven houses face open ice all winter, and a northwest wind across a frozen bay finds every gap on the lake side. Rooms on that side, often the ones with the most glass, run cooler than the rest even with a healthy furnace. Sealing air leaks, checking the duct runs that feed those rooms and setting the blower to move enough air usually close the gap. Houses from the 1930s to 1950s add uninsulated rim joists and water lines along outside walls that can freeze in a long cold snap.
What goes wrong with cooling in Deephaven in summer?
Lake humidity is Deephaven's summer issue. Lower levels close to the water stay damp, and an air conditioner that short-cycles cools the main floor without drying the basement. A whole-home dehumidifier on the lower level, or ducted into the return, handles moisture the AC can't. In the 1930s to 1950s houses, cooling arrived as an afterthought, so small returns and a coil squeezed onto an older furnace are common, and both limit how much water the system pulls out. Condensate drains here run nearly nonstop in July and August, so keep them clear.
Which utilities and rebates apply in Deephaven?
CenterPoint pays rebates on high-efficiency furnaces and on boilers, useful where an older house still runs on hot water, with the installer of your choosing and an application filed the same calendar year. Xcel's rebates take in central AC, heat pumps and mini-splits, with heat pump rebates requiring a Trade Partner Network installer, so check before you buy. Saver's Switch and AC Rewards pay you for letting Xcel trim AC use on peak days.
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.
Most-requested in Deephaven
Furnace repair in Deephaven In estate-era houses, the furnace may heat only part of the house, with a boiler on the rest. Furnace replacement in Deephaven Furnace replacement in Deephaven costs $4,500–$9,500 installed, quoted flat-rate and in writing after a Manual J. AC repair in Deephaven Lake humidity keeps condensate drains working all summer, and a clogged one often shuts a system off. AC replacement in Deephaven Central AC replacement in Deephaven costs $5,200–$9,800 installed, flat-rate in writing from a Manual J that counts lake exposure. Heat pumps in Deephaven Heat pump installation in Deephaven runs $7,500–$14,500 with us, on a written quote. Mini-splits in Deephaven Ductless mini-split installation in Deephaven costs $4,200–$12,500 with a written flat-rate quote, for older lake houses with boilers. Boiler service in Deephaven A house with a boiler in one wing and ducts in another is a normal job here, priced flat-rate in writing before work begins. Tune-ups in Deephaven A furnace or AC tune-up in Deephaven starts at $129, and both together are $219.
More HVAC services we offer
Deephaven HVAC questions
Who repairs furnaces and air conditioners in Deephaven, MN?
Central Minnesota Heating and Cooling, owned by Eric Brown and in business since 2009, serves Deephaven and nearby towns in Hennepin County, about 14 miles from downtown Minneapolis. We're open 7 days, 7am–9pm, and no-heat calls get priority. Call 612-429-3465.
How much does an HVAC service call cost in Deephaven?
An HVAC service call in Deephaven 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.
Most Deephaven homes are on private wells. Does well water matter for a furnace humidifier?
Yes, well water matters for a humidifier. A bypass or flow-through humidifier runs house water over a pad, and if your well water is hard, it leaves minerals behind, so the pad crusts over, the water valve sticks and the drain line can plug. Plan on changing the pad more often than a house on city water would, and have the feed and drain checked at the fall tune-up. A steam humidifier handles minerals differently but needs its own cleaning schedule.
Our older Deephaven house has a boiler for part of it and a furnace for the rest. Should we combine them?
Not always. Hot-water heat through radiators or floor tubing is comfortable and often worth keeping, and replacing only the failing half can make more sense. Combining means running ducts into the boiler-heated rooms, which is hard behind plaster, or letting one boiler feed both the radiators and a hot-water coil in the duct system. We look at each system's age and condition first.
CenterPoint replaced the gas line or meter on our Deephaven street. Should anything on the furnace be checked?
Only if something changed at your house. If your service line or meter was replaced, older appliances with standing pilots may have needed relighting. If the meter moved, make sure the furnace's PVC vent still keeps the distance from the meter and regulator that its installation manual lists. A tune-up covers both.
Who supplies gas and electricity in Deephaven, and who handles rebates?
CenterPoint Energy supplies natural gas and Xcel Energy supplies electricity, which Xcel's own communities-served list confirms as electric only. That split sets the rebate path: furnace and boiler rebates come from CenterPoint, while AC and heat pump rebates come from Xcel. Check your latest bill before ordering equipment, and call CenterPoint first if you ever smell gas.
Also serving near Deephaven
- Excelsior, MN 2 mi
- Minnetonka, MN 2 mi
- Shorewood, MN 3 mi
- Wayzata, MN 4 mi
- Orono, MN 4 mi
- Chanhassen, MN 4 mi
- Long Lake, MN 4 mi
- Spring Park, MN 5 mi
Guides for Deephaven homeowners
Is a Communicating HVAC System Worth It in Minnesota?
A 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.
Read the guideFurnace Pressure Switch: What It Does and Why It Trips
A furnace pressure switch proves the inducer is venting exhaust before the gas can open. Why it trips in a Minnesota winter, what you can check, and the cost.
Read the guide- AC Leaking Water Inside the House: Causes and What to DoCooling
- Can You Run a Furnace Without a Filter?Maintenance
- Where to Put Carbon Monoxide Alarms in a Minnesota HomeAir Quality
Brands we service in Deephaven: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Contact Us
Heat out in Deephaven? Call or send a request.