Generally, you should have your HVAC system serviced at least once a year. Air conditioners should be inspected in the spring before use, and furnaces or other heating equipment should be inspected in the fall before use.

With proper maintenance, an HVAC system can last 15-20 years, though some components like furnaces may last up to 25 years, and central air conditioning units might last 10-15 years. This also is dependent on the weather conditions in your area. Certain factors like frequent days of extreme heat or freezing temperatures can put more wear on your system. More frequent maintenance checks would be needed for units experiencing these weather conditions to prevent systems from breaking down too early.

It varies based on personal preference, season, and energy-saving goals. In winter, 68°F (20°C) while you’re awake and lower while you’re asleep or away from home is recommended. In summer, 78°F (26°C) when you’re at home and higher when you’re away is suggested for the best savings on your energy bill.

Regularly changing air filters ensures optimal system efficiency, improves indoor air quality, and protects the equipment from potential damage due to clogging and added strain to your HVAC system.

Typically, filters should be checked every month and replaced every 3 months, or sooner if they look dirty or clogged.

The size of an HVAC system depends on various factors like the total square footage of your home, its insulation, window type and number, and local climate. It’s essential to have a professional HVAC contractor to come inspect and determine the correct size unit your your home or business.

This could be due to several reasons, including a dirty filter, thermostat issues, low refrigerant, or malfunctioning components. Contact a professional to diagnose and fix the problem.

Yes! A programmable thermostat can help reduce energy consumption by allowing you to set temperatures based on your schedule. This means you can set your system to use less energy when you’re away or asleep, leading to savings on your energy bill.

SEER stands for Seasonal Energy Efficiency Ratio. It measures the efficiency of air conditioners and heat pumps. A higher SEER rating indicates more energy efficiency, which can lead to lower energy bills.

Furnaces can make noises for various reasons, such as a dirty burner, loose or worn-out belts, or other mechanical issues. Any unusual sounds should be checked by a professional to ensure safe and efficient operation.

There could be several reasons, including a thermostat set to the wrong setting, a dirty or clogged filter, refrigerant issues, or electrical problems. It’s best to have a professional diagnose and fix the issue.

Consider replacement if your system is over 10-15 years old, requires frequent repairs, is inefficient (leading to high energy bills), or fails to maintain comfort in your home.