Resources
General, practical information to help you understand your system between service visits. This isn't a substitute for a professional inspection.
Most standard 1-inch filters need changing every 1-3 months, more often if you have pets or run the system heavily. A thicker media filter (4-5 inch) often lasts 6-12 months. Check monthly until you know your home's pattern.
A moderate setback while you're away or asleep — commonly a few degrees warmer in summer or cooler in winter than your normal comfort setting — tends to save energy without a large comfort trade-off. A programmable or smart thermostat automates this.
Unusual smells (especially gas or burning), water leaking near your equipment, a system that won't turn on or off, or a sudden spike in your energy bill are all good reasons to schedule a diagnostic visit rather than waiting.
Persistent hot or cold rooms are usually airflow-related — duct leaks, closed or blocked vents, or a duct system that was never balanced for that room. See our ductwork services page for more detail.
With regular maintenance, furnaces often last 15-20 years and central air conditioners 12-15 years, though this varies by usage, installation quality, and maintenance history.
A load calculation estimates how much heating and cooling a home actually needs based on size, insulation, windows, and orientation — it's how a system should be sized, rather than just matching the old unit's capacity.