High energy bills are often caused by a dirty or clogged air filter, low refrigerant, leaky duct work, poor home insulation, or an aging inefficient HVAC system. A system running constantly without reaching the set temperature is a major red flag. Scheduling an efficiency tune-up can identify the cause and reduce bills by 10–30% in many cases.

Homeowners can safely handle several HVAC maintenance tasks: replacing air filters every 1–3 months, keeping the outdoor condenser unit clear of debris and vegetation (maintain 2 feet of clearance), checking and replacing thermostat batteries, keeping supply and return vents unobstructed, and pouring a cup of diluted bleach into the condensate drain annually to prevent clogs. All other maintenance — refrigerant checks, electrical testing, and coil cleaning — should be handled by a certified technician.

Standard 1-inch air filters should be replaced every 1–3 months. Thicker 4–5 inch media filters can last 6–12 months. If you have pets, allergies, or live in a dusty area, replace filters more frequently. A clogged filter forces your system to work harder, increasing energy use and wear on the blower motor.

Closing vents in unused rooms is a common misconception. Most HVAC systems are designed for the total square footage of your home. Closing vents increases static pressure in the duct work, which can cause air leaks, reduce efficiency, and put stress on the blower motor — sometimes leading to premature system failure. Instead, use a zoning system for targeted temperature control in specific areas.