Spring HVAC Prep: What to Check Before You Switch From Heat to AC

As winter finally loosens its grip on Carlton, Duluth, Cloquet, and the surrounding Northland, it’s time to start thinking about that first warm day—when you’ll switch from heat to AC. Before you flip the thermostat, a little spring HVAC prep can go a long way in keeping your system efficient, reliable, and ready for Minnesota’s humid summer months.

At Brent’s Heating & Cooling, we help homeowners and cabin owners across Carlton County, St. Louis County, Pine County, and Lake County make a smooth seasonal transition. Here’s a simple guide for what to check before you switch your system from heating to cooling.

1. Replace or Clean Your HVAC Filter

A dirty filter makes your air conditioner work harder—and costs you more in energy bills. Spring is the perfect time for a fresh filter, especially after heavy winter furnace use. This quick step alone improves airflow, indoor air quality, and AC performance.

2. Clear and Inspect Your Outdoor AC Unit

Snow, leaves, and debris often pile up around outdoor AC units during Minnesota winters. Before starting your system:

• Remove debris, branches, or weeds
• Check for ice damage or bent fins
• Ensure clear airflow around the entire unit

A clean unit helps prevent “air conditioner not cooling” issues once temps rise.

3. Test Your Thermostat

If you’re running a standard or smart thermostat, spring is a great time to recalibrate settings, replace batteries if needed, or consider upgrading to a smart thermostat for energy savings. Smart thermostat installation can make seasonal transitions easier and improve comfort all year long.

4. Check Vents and Ductwork

Walk through your home and make sure vents are open, unblocked, and clean. If you’ve noticed uneven heating or suspect leaks, you may need ductwork repair or air duct cleaning to keep your AC running efficiently.

5. Look for Signs of Winter Wear

Harsh Minnesota cold can stress heating and cooling equipment. Look for:

• Unusual noises from the furnace or heat pump
• Humidity issues indoors
• Strange odors when the system runs
• Short cycling or slow startup

Any of these could be early signs of a problem that’s easier—and cheaper—to fix now than mid‑summer.

6. Schedule a Professional Spring AC Tune‑Up

A seasonal tune‑up keeps your air conditioner running safely, efficiently, and reliably when you need it most. Brent’s Heating & Cooling offers spring AC tune‑ups and annual HVAC maintenance plans for Duluth, Carlton, Cloquet, Esko, Hermantown, Proctor, Moose Lake, and surrounding areas. Our technicians inspect refrigerant levels, electrical components, coils, and overall system performance to prevent breakdowns before the summer heat hits.

7. Consider Upgrading Aging Equipment

If your air conditioner is 10–15 years old, this is a great time to talk about energy‑efficient upgrades like cold‑climate heat pumps or ductless mini split systems from Mitsubishi Electric or Trane. Modern systems offer quieter operation, lower energy bills, and better comfort for Minnesota’s variable climate.

Prepare Your Home for a Smooth Transition Into Summer

Making the switch from heat to AC is the perfect reminder to give your HVAC system some attention. Whether you need AC maintenance, mini split installation, heat pump service, or help diagnosing an “AC not cooling” issue, Brent’s Heating & Cooling is here for you. Our locally owned team has proudly served the Northland since 2003 with friendly service and reliable results.

Need a spring HVAC tune‑up in Carlton or Duluth?
Call Brent’s Heating & Cooling at (218) 390‑1479 or visit www.brentshvac.com to schedule service.