Aux Heat vs Emergency Heat on a Heat Pump Thermostat
Aux comes on by itself to help a heat pump; emergency mode is a manual, backup-only setting. When each is normal in Minnesota and what both cost to run.
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Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in Coon Rapids (Anoka County), about 10 miles from downtown Minneapolis.
Coon Rapids grew fast from the late 1950s through the 1980s, filling the land between the Coon Rapids Dam and Bunker Hills with block after block of ramblers and split-entries, and it is split between two electric utilities by a railroad line.
Updated October 27, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: Coon Rapids Dam Regional Park · Bunker Hills Regional Park · Anoka-Ramsey Community College · Mercy Hospital · Mississippi River
Book in Coon RapidsCoon Rapids became a village in 1952, and Orrin Thompson built here from the 1950s on: his Thompson Park and Thompson Heights neighborhoods account for about a quarter of the city's homes. The first-generation Thompson ramblers were around 960 square feet with three bedrooms and one bath, served by a modest furnace, short duct runs and one or two returns. Many have since been expanded with additions, finished basements and garages turned into living space, each one stretching a duct system built for a very small house.
Larger ramblers and split-entries followed through the 1960s and 70s, and two-stories and townhomes came in the 1980s and 90s. Those houses have roomier mechanical areas and more generous ductwork. They have also reached the age where the original condensers are long gone and the first replacements, some still on R-22, are coming out.
The small Thompson ramblers heat up quickly but lose heat quickly too, and an addition at the end of a long duct run is usually the coldest room in the house. Split-entries from the 1960s and 70s run cold on the lower level. Across the city, many 80% furnaces still vent into masonry chimneys, and a flue partly blocked by fallen liner tile or debris shows up as a CO alarm or a water heater that won't stay lit.
Houses along the Mississippi near Coon Rapids Dam and along Coon Creek see more humidity and a June dose of cottonwood fluff on their condensers. In the Thompson ramblers, an air conditioner sized for the original floor plan may now serve a house with an addition and a finished basement, so the far rooms lag. A converted garage or new porch is often better served by its own ductless head than by stretching the ducts.
CenterPoint's rebates on high-efficiency furnaces and boilers work with the dealer of your choice. Electricity follows the Burlington Northern tracks. North of them, Connexus Energy offers heat pump rebates, including ductless models, an AC rebate and a reduced-rate program for heat pumps paired with a furnace. South of them, Xcel Energy's heat pump rebates go through its Trade Partner Network, and a few western homes are on Anoka Municipal Utility. Ask whether the rebate needs a registered contractor.
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 Coon Rapids and nearby towns in Anoka County, about 10 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 Coon Rapids 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.
Your electric utility depends on which side of the Burlington Northern railroad tracks you live on. The city says Xcel Energy serves the area south of the tracks plus the Thompson Heights 3rd and 4th Additions, Connexus Energy serves north of the tracks, and a few homes at the western city limits buy power from Anoka Municipal Utility. Your electric utility decides which AC and heat pump rebates apply.
Possibly, if the unit meets your electric utility's rules. Connexus Energy offers a ductless air-source heat pump rebate for ENERGY STAR units that meet its efficiency minimums, and Xcel Energy runs its own heat pump programs with different requirements. Programs and amounts change every year, so check the current terms, then pick equipment that qualifies. Ask whether the rebate you want needs a registered contractor.
Often. The small ramblers built here in the 1950s and 60s usually have one or two return grilles, and a modern furnace blower pulls harder than the original. Air forced through too little return shows up as a roar at the grille, a whistle at the filter, or a duct that booms when the blower starts. Adding a return or a larger filter grille usually quiets it and lets the blower last longer.
Whether a 96% furnace pays off depends on the chimney as much as the gas bill. A small rambler burns less gas than a big house, so the savings take longer to cover the difference: our installed prices run roughly $4,500–$6,000 for an 80% furnace and $6,500–$9,500 for a 96–98% model. If the chimney needs a liner either way, or the water heater is moving to PVC too, the 96% furnace usually comes out ahead.
Aux comes on by itself to help a heat pump; emergency mode is a manual, backup-only setting. When each is normal in Minnesota and what both cost to run.
Read the guideMake-up air replaces what a range hood blows outside. Learn when Minnesota's code requires it, why big hoods can backdraft a water heater, and how to fix it.
Read the guideWater under your furnace, even in summer? Find the source by where it drips: drain, pump, humidifier or AC coil, and what our $79 trip charge covers.
Read the guideBrands we service in Coon Rapids: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Coon Rapids? Call or send a request.