What's Normal When You First Turn On the Furnace in Fall
Turning the furnace on this fall? What to do before the start-up, which smells and sounds are normal, and the filter, humidifier and CO alarm steps.
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Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in Oakdale (Washington County), about 15 miles from downtown Minneapolis.
Oakdale incorporated in 1968 and grew from about 7,800 people in 1970 to more than 28,000 today, so most of its houses are split-entries, two-stories and townhomes from the 1970s through the 1990s.
Updated October 21, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: Tanners Lake · Tilsen Park (on the 45th parallel) · Oakdale Nature Preserve · Interstate 694 · Interstate 94
Book in OakdaleOakdale's housing tracks its growth spurts. The 1970s added more than 4,000 residents and the 1990s about 8,000, some of it on land annexed as the city filled out its boundaries after the Oakdale and Northdale townships combined. The earlier wave is mostly split-entries with the furnace and gas water heater side by side on the lower level; many have had one replacement already, and some of those first replacements were 80% furnaces that kept the chimney in service.
The 1990s wave brought two-stories and townhome associations, with longer duct runs to the second floor and equipment now 25 to 35 years old. Houses from that decade were often built with a condensing furnace and PVC venting from the start, so a replacement there is simpler: the venting and drain already exist and mainly need checking. The work shifts to the ductwork, which is often undersized on the return side.
Condensate is the winter weak spot in newer Oakdale houses. A high-efficiency furnace drains water all season, and a drain line run through a cold garage or along an outside wall can freeze solid in a cold snap, backing water into the furnace until a safety switch shuts it off. The fix is rerouting the line inside or adding heat tape. In townhomes, the PVC exhaust often exits near a neighbor's window or deck, and its plume can coat siding and railings with frost.
Oakdale's two-stories run a familiar July pattern: the upstairs bedrooms sit several degrees warmer than the main floor, because hot air rises and the longest duct runs feed those rooms. Running the fan on its circulate setting, partly closing a few main-floor supplies and keeping a clean filter get you part of the way. The rest usually takes return air upstairs, since many of these houses have one or two small returns for the whole floor. Pushing a bigger AC through the same ducts rarely helps.
Xcel Energy is the only utility on Oakdale bills, and its current Minnesota rebate list covers gas furnaces and boilers, central AC, air-source and cold-climate heat pumps, mini-splits, heat pump water heaters, and smart thermostats enrolled in AC Rewards. Several of those rebates require an Xcel-registered contractor, so ask whether yours does before you sign a quote. Saver's Switch, which cycles the AC on peak afternoons in exchange for bill savings, is open to Oakdale customers too.
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 Oakdale and nearby towns in Washington County, about 15 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 Oakdale 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.
Usually on the upper main level, on an inside wall away from supply registers, sunny windows and the kitchen. The catch in a split-entry is that the lower level never gets a vote, so it runs cool in winter. A smart thermostat with a remote sensor downstairs can average the two levels, and balancing dampers do the rest. A thermostat on the stairwell wall tends to read the warm air rising from below.
Often. A 90%+ furnace exhausts cool, damp air that frosts whatever it blows onto. The maker's instructions and code set clearances from windows, doors, decks and the property line, so the fix is a longer run to a wall facing open yard or up through the roof.
Start with the data plate inside the furnace door for its age, then look at the venting: metal pipe into a chimney or PVC out the wall. Make sure CO alarms sit within 10 feet of every bedroom, as state law requires, including any on the lower level. Note the filter size and condition. On the AC, the label shows the refrigerant; R-22 means older equipment. A tune-up, from $129, gives you a baseline.
Sometimes, but try the cheaper fixes first: more return air upstairs, a blower speed set for cooling, and balancing dampers. If the second floor still lags, zoning with a variable-speed system is the next step. A separate upstairs system usually means an air handler and ducts in the attic, which in Minnesota brings frost, condensation and heat-loss problems, so we suggest it only when the house can't be fixed another way.
Turning the furnace on this fall? What to do before the start-up, which smells and sounds are normal, and the filter, humidifier and CO alarm steps.
Read the guideEight heat pump buying mistakes Minnesota homeowners make, from shopping by SEER2 to ground-level outdoor units and outdated rebates, and how to avoid them.
Read the guideDakota County HVAC rebates depend on your electric and gas utilities: Dakota Electric, Xcel, CenterPoint, plus the CDA loan. How to read your bills and start.
Read the guideBrands we service in Oakdale: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Oakdale? Call or send a request.