Frequently Asked Questions

Most homeowners should plan to change (or clean, if reusable) their air conditioner/heat pump air filter about every 1–3 months during cooling season. A good rule of thumb is **every 30 days** if you have pets, allergies/asthma, a dusty home, or run the system frequently; **every 60–90 days** may be fine for lighter use with no pets. Higher-efficiency pleated filters (often 3–5" thick, used in some systems) can sometimes last **3–6 months**, but it’s still best to check them regularly. The simplest approach is to **inspect the filter monthly**. If it looks gray, loaded with dust, or you can’t see much light through it, replace it. A clogged filter restricts airflow, which can reduce comfort, raise energy bills, and contribute to issues like coil icing and unnecessary wear on the blower. Always install the correct **size** and follow the airflow arrow on the filter frame. If you’re not sure which filter type is best for your system (especially if you’re considering a higher MERV rating), or you’re changing filters often and suspect airflow or duct issues, we’re happy to help. Call **Mack Morris Heating & Air Conditioning** at **(434) 823-2665** for personalized recommendations for your Charlottesville/Central Virginia home.

Our IAQ testing uses the AirAdvice for Homes® M5200 to measure key factors that impact health, comfort, and safety—like particles, chemical pollutants (VOCs), CO₂, temperature, relative humidity, and carbon monoxide. You’ll receive a clear report (FlashReport or SmartIAQ), and we’ll explain what it means and which improvements make the biggest difference for your home. [Schedule an IAQ Test](https://mackmorrisheating.com/contact) [Find our more about indoor air quality](https://mackmorrisheating.com/services/indoor-air-quality)

Proper AC care starts with routine maintenance you can do at home. The most important step is changing or cleaning your air filter regularly (typically every 1–3 months, more often with pets, allergies, or heavy use). A clean filter improves airflow, helps your system cool efficiently, and reduces strain on the blower and compressor. Also keep supply/return vents inside your home open and unobstructed, and set your thermostat to a consistent, reasonable temperature to avoid excessive cycling and wear. Outside, keep the outdoor condenser unit clear. Remove leaves, grass clippings, and debris, and maintain at least 2 feet of clearance around the unit for proper airflow. Gently rinse the outdoor coil with a garden hose (light pressure) if it’s visibly dirty—avoid pressure washers, which can damage the fins. Make sure the unit stays level, and trim back shrubs or branches that can block airflow. If you notice ice on the refrigerant lines, unusual noises, weak airflow, or higher-than-normal utility bills, it’s best to shut the system off and have it checked to prevent bigger issues. Finally, schedule professional tune-ups—ideally once a year in the spring—so a technician can clean and inspect coils, verify refrigerant charge, check electrical components, confirm safe drainage, and ensure the system is operating at peak efficiency. If you’d like personalized guidance for your specific equipment and home, call Mack Morris Heating & Air Conditioning at (434) 823-2665.

In winter in Virginia, a good general guideline is to set your thermostat back about **5–10°F lower than your normal “home” temperature** while you’re away. For many households, that ends up around **60–65°F** during daytime absences, depending on comfort needs, insulation, and your heating system. This helps reduce energy use without letting the home get so cold that the system has to work excessively hard to recover. If you’ll be gone **overnight or for multiple days**, it’s usually smart to keep the home at **no lower than 55–60°F**. That helps protect plumbing from freezing and reduces moisture-related issues. Also consider your specific situation—homes with older insulation, drafty areas, or rooms over crawlspaces may need a slightly higher setting, and households with pets or sensitive individuals may prefer less of a setback. A few practical tips: use a **programmable or smart thermostat** to automate set-backs and warm-ups, and make sure your system is maintained (clean filter, clear vents, and a tuned-up furnace/heat pump) so it can recover efficiently. If you’re uncertain what setback is best for your equipment—especially with heat pumps or dual-fuel systems—call **Mack Morris Heating & Air Conditioning at (434) 823-2665** and we’ll help you choose settings that balance comfort, efficiency, and protection for your home.

We recommend servicing your HVAC system twice a year - once before heating season and once before cooling season. Regular maintenance helps prevent breakdowns and improves efficiency.