https://centralminnesotaheatingandcooling.com/blog Heating and cooling guides for homes in Minneapolis, Saint Paul and 50 miles around. en-us https://centralminnesotaheatingandcooling.com/blog/ac-fan-not-spinninghttps://centralminnesotaheatingandcooling.com/blog/ac-fan-not-spinningMon, 28 Sep 2026 12:00:00 GMTOutdoor AC fan stopped while the unit hums? Usually a capacitor, fan motor or contactor. Why to shut it off now, what you can check safely, and typical costs. https://centralminnesotaheatingandcooling.com/blog/best-thermostat-setting-minnesota-winterhttps://centralminnesotaheatingandcooling.com/blog/best-thermostat-setting-minnesota-winterMon, 28 Sep 2026 12:00:00 GMT68–70°F while you're home and awake, lower at night, never below 55°F when you're away. What setbacks save, how heat pumps differ, how to avoid wet windows. https://centralminnesotaheatingandcooling.com/blog/furnace-flashing-light-codeshttps://centralminnesotaheatingandcooling.com/blog/furnace-flashing-light-codesMon, 28 Sep 2026 12:00:00 GMTThe blinking light on a furnace is a fault code from the control board. How to read it safely, what common codes mean, and when a reset is fine or not. https://centralminnesotaheatingandcooling.com/blog/heat-pump-blowing-cold-airhttps://centralminnesotaheatingandcooling.com/blog/heat-pump-blowing-cold-airMon, 28 Sep 2026 12:00:00 GMTHeat pump air feels cool next to a furnace even when it works. How to tell normal from a fault: defrost, a thermostat setting, low charge or no aux heat. https://centralminnesotaheatingandcooling.com/blog/heat-pump-running-constantlyhttps://centralminnesotaheatingandcooling.com/blog/heat-pump-running-constantlyMon, 28 Sep 2026 12:00:00 GMTInverter heat pumps are built for long, slow runs, so nonstop running in a Minnesota winter is often normal. The signs of a real problem and what to check. https://centralminnesotaheatingandcooling.com/blog/how-long-does-an-ac-last-minnesotahttps://centralminnesotaheatingandcooling.com/blog/how-long-does-an-ac-last-minnesotaMon, 28 Sep 2026 12:00:00 GMTCarrier and Lennox put central AC life at 15–20 years. Why Minnesota's short summers help, what cottonwood, salt and hail do, and when to repair or replace. https://centralminnesotaheatingandcooling.com/blog/how-long-does-furnace-installation-takehttps://centralminnesotaheatingandcooling.com/blog/how-long-does-furnace-installation-takeMon, 28 Sep 2026 12:00:00 GMTA straight furnace swap is usually done in one day. Venting changes, a chimney liner, gas line or duct work, and the permit inspection add time. What to expect. https://centralminnesotaheatingandcooling.com/blog/how-often-change-furnace-filterhttps://centralminnesotaheatingandcooling.com/blog/how-often-change-furnace-filterMon, 28 Sep 2026 12:00:00 GMTCheck a 1-inch furnace filter monthly and change it at least every 3 months; deep media filters last longer. Pets, smoke and a fan left on shorten it. https://centralminnesotaheatingandcooling.com/blog/orphaned-water-heater-chimney-linerhttps://centralminnesotaheatingandcooling.com/blog/orphaned-water-heater-chimney-linerMon, 28 Sep 2026 12:00:00 GMTAn orphaned water heater is left alone in a chimney sized for two appliances after a 90%+ furnace goes in. Why it drafts poorly, the CO risk and the fixes. https://centralminnesotaheatingandcooling.com/blog/thermostat-blank-screenhttps://centralminnesotaheatingandcooling.com/blog/thermostat-blank-screenMon, 28 Sep 2026 12:00:00 GMTA blank thermostat screen usually means lost power: dead batteries, a tripped furnace switch, a blown board fuse or a condensate switch. What to check first. https://centralminnesotaheatingandcooling.com/blog/what-is-manual-j-load-calculationhttps://centralminnesotaheatingandcooling.com/blog/what-is-manual-j-load-calculationMon, 28 Sep 2026 12:00:00 GMTA Manual J load calculation works out how much heating and cooling your house needs. What goes into it, why the old nameplate oversizes and what to ask. https://centralminnesotaheatingandcooling.com/blog/what-size-furnace-do-i-needhttps://centralminnesotaheatingandcooling.com/blog/what-size-furnace-do-i-needMon, 28 Sep 2026 12:00:00 GMTFurnace 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. https://centralminnesotaheatingandcooling.com/blog/why-is-my-ac-freezing-uphttps://centralminnesotaheatingandcooling.com/blog/why-is-my-ac-freezing-upMon, 28 Sep 2026 12:00:00 GMTIce on your AC lines or indoor coil means too little airflow or too little refrigerant. What to do right now, what you can check, and when to call. https://centralminnesotaheatingandcooling.com/blog/aux-heat-vs-emergency-heathttps://centralminnesotaheatingandcooling.com/blog/aux-heat-vs-emergency-heatSun, 27 Sep 2026 12:00:00 GMTAux heat comes on by itself to help a heat pump; emergency heat is a manual switch for a failed heat pump. When each is normal in Minnesota and what it costs. https://centralminnesotaheatingandcooling.com/blog/boiler-expansion-tankhttps://centralminnesotaheatingandcooling.com/blog/boiler-expansion-tankSun, 27 Sep 2026 12:00:00 GMTA 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. https://centralminnesotaheatingandcooling.com/blog/communicating-hvac-systemhttps://centralminnesotaheatingandcooling.com/blog/communicating-hvac-systemSun, 27 Sep 2026 12:00:00 GMTA communicating HVAC system uses a two-way data link between thermostat, furnace and outdoor unit. What it does, what it locks you into, and when it pays. https://centralminnesotaheatingandcooling.com/blog/furnace-inducer-motorhttps://centralminnesotaheatingandcooling.com/blog/furnace-inducer-motorSun, 27 Sep 2026 12:00:00 GMTThe inducer motor is the small fan that starts first and pushes exhaust out the vent. Noises and codes of a failing one, repair vs replace, and cost. https://centralminnesotaheatingandcooling.com/blog/furnace-pressure-switchhttps://centralminnesotaheatingandcooling.com/blog/furnace-pressure-switchSun, 27 Sep 2026 12:00:00 GMTA 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. https://centralminnesotaheatingandcooling.com/blog/furnace-red-tag-meaninghttps://centralminnesotaheatingandcooling.com/blog/furnace-red-tag-meaningSun, 27 Sep 2026 12:00:00 GMTA red tag means a technician or the gas utility found your furnace unsafe and shut it off. Common reasons, what not to do, and how to get a second opinion. https://centralminnesotaheatingandcooling.com/blog/hspf2-cop-heat-pump-ratingshttps://centralminnesotaheatingandcooling.com/blog/hspf2-cop-heat-pump-ratingsSun, 27 Sep 2026 12:00:00 GMTHSPF2 is a heat pump's seasonal heating average; COP is its efficiency at one temperature. What matters at 5°F, and how to read a spec sheet or NEEP list. https://centralminnesotaheatingandcooling.com/blog/kitchen-make-up-air-minnesotahttps://centralminnesotaheatingandcooling.com/blog/kitchen-make-up-air-minnesotaSun, 27 Sep 2026 12:00:00 GMTMake-up air replaces what a range hood blows outside. What Minnesota's mechanical code requires, why big hoods can backdraft a water heater, and the fixes. https://centralminnesotaheatingandcooling.com/blog/r-454b-r-32-refrigerant-changehttps://centralminnesotaheatingandcooling.com/blog/r-454b-r-32-refrigerant-changeSun, 27 Sep 2026 12:00:00 GMTR-454B and R-32 are the lower-GWP refrigerants in new ACs and heat pumps. What the EPA rule says, what A2L means, and what it means for your R-410A system. https://centralminnesotaheatingandcooling.com/blog/seer2-vs-seerhttps://centralminnesotaheatingandcooling.com/blog/seer2-vs-seerSun, 27 Sep 2026 12:00:00 GMTSEER2 replaced SEER on January 1, 2023 under a tougher DOE test, so the numbers read lower. What it measures, Minnesota's 13.4 minimum, and what's worth buying. https://centralminnesotaheatingandcooling.com/blog/what-is-static-pressure-hvachttps://centralminnesotaheatingandcooling.com/blog/what-is-static-pressure-hvacSun, 27 Sep 2026 12:00:00 GMTStatic pressure is the resistance your furnace blower pushes against in the ducts and filter. Why it matters for a new furnace or AC, symptoms and fixes. https://centralminnesotaheatingandcooling.com/blog/ac-leaking-water-insidehttps://centralminnesotaheatingandcooling.com/blog/ac-leaking-water-insideSat, 26 Sep 2026 12:00:00 GMTWater by the furnace in July? What's normal dripping and what's a leak, the usual causes (drain, pump, iced coil, cracked pan), and what to do right now. https://centralminnesotaheatingandcooling.com/blog/boiler-replacement-cost-minnesotahttps://centralminnesotaheatingandcooling.com/blog/boiler-replacement-cost-minnesotaSat, 26 Sep 2026 12:00:00 GMTWhat a new boiler costs in Minnesota: national ranges, cast iron vs condensing vs combi, steam vs hot water, chimney venting, and why the radiators stay. https://centralminnesotaheatingandcooling.com/blog/can-a-furnace-leak-carbon-monoxidehttps://centralminnesotaheatingandcooling.com/blog/can-a-furnace-leak-carbon-monoxideSat, 26 Sep 2026 12:00:00 GMTYes. How a gas furnace leaks carbon monoxide, the symptoms MDH lists, Minnesota's CO alarm law, what to do when the alarm sounds and what a red tag means. https://centralminnesotaheatingandcooling.com/blog/does-central-ac-bring-in-outside-airhttps://centralminnesotaheatingandcooling.com/blog/does-central-ac-bring-in-outside-airSat, 26 Sep 2026 12:00:00 GMTNo. Central air recirculates the air already inside. How fresh air really gets into a Minnesota house, whether AC dries the air, and when to add an HRV. https://centralminnesotaheatingandcooling.com/blog/does-furnace-need-to-be-on-for-achttps://centralminnesotaheatingandcooling.com/blog/does-furnace-need-to-be-on-for-acSat, 26 Sep 2026 12:00:00 GMTYes. Central AC runs on the furnace's blower, filter and low-voltage power. What each part does in July, what to check at the furnace, and when to call. https://centralminnesotaheatingandcooling.com/blog/furnace-and-ac-replacement-cost-minnesotahttps://centralminnesotaheatingandcooling.com/blog/furnace-and-ac-replacement-cost-minnesotaSat, 26 Sep 2026 12:00:00 GMTReplacing the furnace and AC together in Minnesota costs $9,700–$19,300 installed with us. Matched coils, AHRI ratings, and when to split the job instead. https://centralminnesotaheatingandcooling.com/blog/furnace-leaking-waterhttps://centralminnesotaheatingandcooling.com/blog/furnace-leaking-waterSat, 26 Sep 2026 12:00:00 GMTWater around your furnace? Find the source by where and when it drips: condensate trap, pump, frozen line, humidifier or AC coil, and what can't wait. https://centralminnesotaheatingandcooling.com/blog/furnace-making-noisehttps://centralminnesotaheatingandcooling.com/blog/furnace-making-noiseSat, 26 Sep 2026 12:00:00 GMTBang at startup, squeal, scrape, rattle, hum, click, whistle or a rumble after shutoff: what each furnace noise means and whether it's safe to keep running. https://centralminnesotaheatingandcooling.com/blog/heat-pump-vs-furnace-minnesotahttps://centralminnesotaheatingandcooling.com/blog/heat-pump-vs-furnace-minnesotaSat, 26 Sep 2026 12:00:00 GMTHeat pump or gas furnace for a Minnesota house? Install prices, fuel used per million BTU, cold-climate limits, and why dual fuel is usually the answer. https://centralminnesotaheatingandcooling.com/blog/how-long-does-a-furnace-last-minnesotahttps://centralminnesotaheatingandcooling.com/blog/how-long-does-a-furnace-last-minnesotaSat, 26 Sep 2026 12:00:00 GMTHow long a furnace lasts in Minnesota: sourced 15–20 year figures, why long winters add wear, signs it's near the end, and how to decide repair or replace. https://centralminnesotaheatingandcooling.com/blog/running-furnace-without-filterhttps://centralminnesotaheatingandcooling.com/blog/running-furnace-without-filterSat, 26 Sep 2026 12:00:00 GMTA few hours without a furnace filter won't hurt much; weeks can. What dust does to the blower, AC coil and heat exchanger, a safe stopgap and the right size. https://centralminnesotaheatingandcooling.com/blog/ac-replacement-cost-minnesotahttps://centralminnesotaheatingandcooling.com/blog/ac-replacement-cost-minnesotaFri, 25 Sep 2026 12:00:00 GMTCentral AC replacement in Minnesota runs $5,200–$9,800 installed with us in 2026. What moves a quote, R-22 systems, and when to repair or go heat pump. https://centralminnesotaheatingandcooling.com/blog/best-central-ac-brands-minnesotahttps://centralminnesotaheatingandcooling.com/blog/best-central-ac-brands-minnesotaFri, 25 Sep 2026 12:00:00 GMTCentral AC brands for Minnesota's short, humid summers: SEER2 payback, humidity control, matching the coil to your furnace, and the R-454B and R-32 switch. https://centralminnesotaheatingandcooling.com/blog/best-furnace-brands-minnesotahttps://centralminnesotaheatingandcooling.com/blog/best-furnace-brands-minnesotaFri, 25 Sep 2026 12:00:00 GMTFurnace brands for a Minnesota winter by tier: Carrier, Trane, Lennox, Rheem, Goodman and Amana lines, plus what matters more at -20°F than the badge. https://centralminnesotaheatingandcooling.com/blog/carrier-vs-trane-vs-lennox-minnesotahttps://centralminnesotaheatingandcooling.com/blog/carrier-vs-trane-vs-lennox-minnesotaFri, 25 Sep 2026 12:00:00 GMTCarrier vs Trane vs Lennox for Minnesota homes: tiers, modulating furnaces, variable-speed AC, cold-climate heat pumps, controls, parts and warranties. https://centralminnesotaheatingandcooling.com/blog/frozen-furnace-condensate-line-minnesotahttps://centralminnesotaheatingandcooling.com/blog/frozen-furnace-condensate-line-minnesotaFri, 25 Sep 2026 12:00:00 GMTFurnace quit in a cold snap and the drain line froze? How it trips the pressure switch, how to thaw it safely, and fixes that keep it from freezing again.