Johnstone Supply - The Bloomington Group: Emergency HVAC Services Serving Minneapolis, MN 55431

First, safely turn off power to the unit. Gently vacuum loose debris and use a commercial coil cleaner, following the product instructions. Rinse carefully with a hose, avoiding electrical components. For persistent grime common in our area, consider a foaming cleaner for deeper penetration. We carry a variety of safe, effective coil cleaning solutions and can recommend the right one for your specific system.

In Minneapolis, with our distinct seasons and varying pollen levels, we recommend checking standard 1-inch filters every month and replacing them at least every 90 days. During high-use seasons like summer and winter, or if you have pets or allergies, changing them every 30-60 days is best for efficiency and air quality. We stock a wide range of MERV ratings and sizes to match your home's needs.

For common upkeep, we recommend having a set of screwdrivers, a multimeter for safety checks, a fin comb to straighten bent coils, and a reliable vacuum with brush attachments. Keep spare air filters of the correct size, and consider having capacitor and contactor replacements for common failures. Our pros can help you build a tailored kit based on your specific furnace and AC model.