Replace standard 1-inch filters every 30-60 days, and thicker filters (4-5 inches) every 3-6 months. However, if you have pets, allergies, or someone smokes in your home, check monthly and replace more frequently. A clogged filter forces your system to work harder, increases energy bills, and can cause expensive repairs. When in doubt, hold your filter up to a light – if you can't see through it clearly, it's time for a new one.

Call Advanced Heating & Cooling immediately at (217) 503-3756 if you experience:
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‍• Strange smells (burning, gas, or musty odors)
‍• Unusual noises (banging, grinding, or loud rattling)
‍• No heating or cooling during extreme weather
‍• Water leaks around your unit
‍• Electrical issues (sparks, frequent breaker trips)

Don't wait – these signs often indicate serious problems that can worsen quickly and cost thousands more if ignored.

Twice yearly is essential – spring for your air conditioner and fall for your furnace. Think of it like getting an oil change for your car. Regular maintenance prevents 85% of HVAC breakdowns, extends your system's life by 5-10 years, and keeps your energy bills 15-20% lower. Our maintenance includes safety checks, cleaning, tune-ups, and catching small problems before they become expensive emergencies.

Sudden spikes in energy costs usually mean your HVAC system is working harder than it should. Common causes include:

‍• Dirty air filters (most common)Refrigerant leaks
‍• Aging equipment losing efficiency
‍• Poor insulation or air leaks
‍• Thermostat problems

‍Good news: Most of these are fixable! Our technicians can diagnose the issue quickly and often solve it the same day, immediately lowering your bills.