HVAC System Care Guide
Keep your heating and cooling running efficiently — and avoid a $5,000 surprise
Your HVAC system is one of the most expensive components of your home, and in San Antonio's climate, it works harder than almost anywhere else in the country. The good news: most HVAC problems are preventable with simple, consistent maintenance. Here's what every homeowner needs to know.
"In San Antonio, your HVAC isn't optional — it's essential. A little preventive maintenance goes a long way toward avoiding a breakdown in the middle of a 100-degree July."
Change Your Filter — Seriously
This is the single most important thing you can do for your HVAC system. A dirty filter restricts airflow, makes the system work harder, and dramatically shortens its lifespan. In San Antonio, where dust and allergens are high, change your filter every 30–60 days during peak seasons. Use a MERV 8–11 filter for the best balance of filtration and airflow.
Schedule Twice-Yearly Professional Tune-Ups
Have a licensed HVAC technician inspect and service your system in spring (before cooling season) and fall (before heating season). A tune-up includes checking refrigerant levels, cleaning coils, inspecting electrical connections, lubricating moving parts, and testing system performance. This typically costs $75–$150 and can prevent repairs that cost 10–20x more.
Keep the Outdoor Unit Clear
Your condenser unit needs at least 2 feet of clearance on all sides. Keep grass, weeds, and shrubs trimmed back. After storms, check for debris inside the unit. Never stack anything against it or cover it while in use. Gently rinse the fins with a garden hose (not a pressure washer) to remove dirt and improve airflow.
Check Your Ductwork
Leaky ducts can waste 20–30% of your conditioned air before it ever reaches your living space. Look for disconnected sections in accessible areas like the attic or crawlspace. Seal leaks with mastic sealant or metal tape (not standard duct tape, which fails over time). If your home has hot or cold spots, duct issues are often the culprit.
Know When to Replace
Most HVAC systems last 15–20 years with proper maintenance. If your system is over 12 years old and requiring frequent repairs, it may be more cost-effective to replace it. Modern systems are significantly more efficient — a new 16 SEER unit can cut your cooling costs by 30–40% compared to an older 10 SEER system. This is also a strong selling point when you list your home.
Quick Checklist
- Replace air filter every 30–60 days
- Schedule spring tune-up before cooling season
- Schedule fall tune-up before heating season
- Clear 2 ft of space around outdoor condenser
- Rinse condenser fins with garden hose
- Check and seal duct leaks
- Test thermostat accuracy
- Inspect drain line for clogs
Is Your HVAC a Selling Point or a Red Flag?
Buyers notice HVAC age and condition. If you're thinking about selling, I can help you understand what upgrades will move the needle on your sale price.
Get a Free Home Valuation