5 Most Common HVAC Problems

Minnesota and Wisconsin weather puts HVAC systems to the test year-round. From brutal winters to hot, humid summers, your heating and cooling system needs to perform reliably. But just like any mechanical system, HVAC units can run into trouble. At Finken, we help homeowners and businesses stay ahead of the most common HVAC issues with expert diagnostics, repairs, and preventative maintenance.

Here are the five most common HVAC problems we see—and what you can do about them.

1. Dirty or Clogged Filters

The Problem:

When air filters are clogged with dust, pet hair, and debris, airflow is restricted.

Symptoms:

• Reduced system efficiency
• Poor indoor air quality
• Uneven heating or cooling
• Higher energy bills

Solution:

Replace filters every 1–3 months. Finken offers maintenance plans that include filter checks to keep your system running clean.

2. Thermostat Malfunctions

The Problem:

Your thermostat acts as the control center for your HVAC system. When it’s malfunctioning, your system can behave erratically.

Symptoms:

• Inconsistent temperatures
• System won’t start or stop
• Short cycling

Solution:

We diagnose and replace faulty thermostats and can upgrade you to smart models for better energy control.

3. Refrigerant Leaks (A/C Systems)

The Problem:

Low refrigerant levels prevent your air conditioner from effectively cooling your home.

Symptoms:

• Warm air blowing from vents
• Ice on evaporator coils
• Hissing sounds or visible leaks

Solution:

Finken's licensed technicians safely locate and repair leaks, recharge refrigerant, and ensure your system is sealed and efficient.

4. Electrical or Capacitor Failures

The Problem:

HVAC systems depend on electrical components to function, including capacitors, relays, and wiring.

Symptoms:

• System won’t turn on
• Frequent tripped breakers
• Unusual clicking noises

Solution:

Our HVAC experts inspect and replace faulty electrical parts to restore safe and reliable operation.

5. Dirty Condenser or Evaporator Coils

The Problem:

Outdoor condenser units and indoor evaporator coils accumulate dirt over time, reducing heat transfer.

Symptoms:

• Reduced cooling capacity
• Higher energy usage
• System overheating or short cycling

Solution:

We clean and maintain coils during annual tune-ups, improving performance and system longevity.

Get Ahead of HVAC Problems with Finken

Most HVAC issues can be avoided with regular maintenance and prompt repairs. At Finken, we offer customized service plans and emergency support to keep your system running smoothly—whether you're in St. Cloud, Baxter, or Melrose.