Homeowner guides
Straight answers about furnaces, boilers, air conditioners, heat pumps, water heaters and indoor air quality, written by the Krinkie’s service team.
Furnaces
Furnaces services →
Furnace AFUE Explained: 80% vs. 90%+ for Minnesota Homes
AFUE tells you how much of the gas a furnace burns becomes heat in your home. Here is how 80% and 90%+ furnaces differ, what that means for installation, and where the federal efficiency rules stand today.
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Why Is My Furnace Blowing Cold Air? Causes and Safe Checks
A furnace that blows cold air usually has a simple setting problem, an airflow problem, or a failed ignition part. Here is how to tell which one you have and what you can safely check yourself.
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Furnace Repair or Replacement? How to Decide
When a furnace breaks down, the right answer depends on its age, its condition, the type of repair and how well it heats your home. This guide walks through each factor so you can make the call with confidence.
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Furnace Sizing: Why a Manual J Load Calculation Matters
The right furnace size depends on how much heat your home loses on a cold day, not on square footage or the size of your old furnace. A Manual J load calculation measures that heat loss.
Read the guide →Boilers
Boilers services →
Annual Boiler Maintenance: What a Technician Checks
A boiler tune-up during heating season covers safety checks, combustion, controls and water-side items. Here is what a technician should inspect and the simple tasks you can handle between visits.
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Why Your Boiler Is Making Noise: Kettling, Banging, Gurgling
Boilers and radiators make different noises for different reasons. Here is what kettling, banging, gurgling and other sounds usually point to, and which ones need a technician.
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Boiler vs. Furnace: Which Fits a Minnesota Home?
A furnace heats air and moves it through ducts. A boiler heats water or steam and moves it through radiators, baseboard or floor tubing. Here is how the two compare for a Minnesota home.
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Condensing and Modulating Boilers Explained
Most high-efficiency gas boilers today are both condensing and modulating. Here is what those terms mean, what conditions they need to reach their rated efficiency, and what to ask before you buy one.
Read the guide →Heat pumps
Heat pumps services →
Do Heat Pumps Work in Minnesota Winters?
Cold-climate heat pumps can heat a Minnesota home through most of the winter, but their output drops on the coldest days. Here is how they work, what the cold-climate rating means, and how backup heat fits in.
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Dual-Fuel Systems: Pairing a Heat Pump With a Gas Furnace
A dual-fuel system uses a heat pump in milder weather and a gas furnace in deep cold. Here is how the switchover works, what equipment it takes, and what to ask before you install one.
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Heat Pump Defrost Mode: What's Normal and What's Not
In a Minnesota winter, a heat pump that steams, goes quiet, or makes a whoosh is usually defrosting. Here is how defrost works, what normal operation looks like, and which signs mean you need service.
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Minnesota Heat Pump Rebates and Incentives: What's Available
The federal heat pump tax credits ended for installations after 2025, and Minnesota's new state rebates have not launched. Utility rebates from Xcel Energy are still available. Here is what we could confirm as of October 2026.
Read the guide →Water heaters
Water heaters services →
How Long Do Water Heaters Last? Signs It Needs Replacing
Most tank water heaters last 10 to 15 years, and tankless units often last longer. Here is how to find your water heater's age and the signs that it is close to failing.
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Tank vs. Tankless Water Heaters for Minnesota Homes
Tank and tankless water heaters both work well in Minnesota homes, but they suit different households. This guide compares efficiency, hot water supply, lifespan and installation factors so you can choose.
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Water Heater Maintenance: Flushing and the Anode Rod
Flushing the tank and checking the anode rod help a tank water heater last longer. This guide covers how often to do each task, the safe steps, and what to leave to a professional.
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How to Choose the Right Water Heater Size
Tank size in gallons does not tell you how much hot water a heater can deliver. This guide explains first-hour rating, how to estimate your peak-hour demand, and how to size a tankless unit.
Read the guide →Air conditioning
Air conditioning services →
AC Repair or Replacement? How to Decide
When your central air conditioner breaks down, the choice between repair and replacement depends on age, the type of repair, refrigerant, and how well the system has performed. This guide walks through each factor.
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What Happens During an AC Tune-Up (and How Often)
An AC tune-up is a set of inspections, cleaning and measurements that keep your central air conditioner running safely and efficiently. Here is what is included, how often to book one, and what you can do between visits.
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Why Your Air Conditioner Is Freezing Up
Ice on an air conditioner usually points to an airflow or refrigerant problem. Here is what causes it, how to thaw the system safely, and which checks you can do yourself.
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SEER2 Ratings Explained for Minnesota Homeowners
SEER2 is the efficiency rating on every new central air conditioner. This guide explains what it measures, the federal minimum that applies in Minnesota, and how to use it when you compare quotes.
Read the guide →Ductless mini-splits
Ductless mini-splits services →
Ductless Mini-Split for an Addition, Garage or Attic?
Additions, garages and finished attics are often the rooms your central system cannot reach well. Here is how to tell whether a ductless mini-split is the right way to heat and cool them.
Read the guide →Ductless Mini-Split vs. Window Air Conditioner
Window air conditioners are cheap and easy to install, but they come with drafts, noise and a blocked window. Here is a direct comparison with ductless mini-splits so you can decide.
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How to Clean and Maintain a Ductless Mini-Split
Clean filters and a clear outdoor unit keep a mini-split running well. Here is what you can safely do yourself, how often, and what to leave to a technician.
Read the guide →Single-Zone vs. Multi-Zone Mini-Split Systems
A single-zone mini-split serves one room. A multi-zone system runs several indoor units from one outdoor unit. Here is how to decide which setup fits your home.
Read the guide →Indoor air quality
Indoor air quality services →
Furnace Filter MERV Ratings Explained
A MERV rating tells you how well a furnace filter captures particles of different sizes. This guide explains the scale, what the EPA recommends, and how to pick a filter your furnace can handle.
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Ideal Indoor Humidity in a Minnesota Winter
In a Minnesota winter, the right indoor humidity depends on how cold it is outside. This guide explains the ranges to aim for, why your windows tell you when it is too high, and how to adjust your humidifier.
Read the guide →Whole-Home Air Purification Options Compared
Media filters, UV lights and electronic air cleaners all install on your furnace, but they do different jobs. This guide explains what each one removes, its limits, and why the EPA warns against devices that produce ozone.
Read the guide →Whole-Home vs. Portable Humidifier: Which to Choose
A portable humidifier adds moisture to one room. A whole-home humidifier works with your furnace to treat the entire house. This guide compares coverage, upkeep, control and cost factors so you can decide.
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