The average HVAC replacement (as of 2025) costs anywhere between $6,775 – $12,310. And the average lifespan of an HVAC system is 12-17 years. However, the lifespan is heavily dependent on regular maintenance, climate, quality of installation and materials, and the usage.
The typical system includes: heating system (furnace or heat pump), cooling unit (air conditioner or heat pump), thermostat, and ductwork (or air handler) to move air flows.
As a homeowner, properly maintaining your HVAC system is essential but you probably have a variety of questions and we would like to help you better understand. Here are the most asked questions homeowners have regarding their HVAC system.
- What maintenance can I do myself?
You can regularly change filters, keep outdoor coils clean and clear debris and close your blinds to block the sun.
- How often should I replace my air filter?
Most experts suggest changing your air filters every one to three months, but it really depends on your home’s environment and the manufacturer recommendation. Also consider changing your filter more frequently if you have pets or you (or someone in the household) have allergies. It is also important to know that high-efficiency filters might last longer—some with 3-6 month periods.
- Should I turn the system off when I leave for vacation?
No, do not turn the system off. Instead, adjust the thermostat higher or lower to save energy while still maintaining your indoor air quality.
- When should I have a professional tune-up my HVAC system?
Contact a professional to annually service your unit (even if you have a furnace) to ensure efficiency and extend the system’s lifespan. Most HVAC companies will set homeowners up on a service contract so customers aren’t troubled with remembering to schedule yearly maintenance.
- How can I save money on bills associated with my system?
Use a programmable thermostat, change filters, and keep your doors and windows closed (this includes your garage door).
- Is my unit too small or too big for my home?
If your unit is too small or too big you’ll experience high energy bills and more wear and tear on your unit. Your unit is too big if it turns on and off quickly (short cycles) leaving your home humid and creating hot and cold spots within the home. Your unit is most likely too small if the unit runs constantly and struggles to reach the set temperature. You should contact a professional if you’re experiencing either scenario.
- What is the difference between AC and heat pump?
An AC (air conditioner) only cools and a heat pump heats and cools by moving heat.
- What are the most common issues with HVAC systems?
Limited cool air or heat, weird smells such as burning or musty, strange noises that like something is rattling and/or grinding, high humidity or poor air circulation, and frozen evaporator coils.
- What can I do to improve my system’s efficiency?
Seal duct leaks, insulate your attic and crawlspace, use a programmable thermostat, and change your filters regularly.
- What is a zoned air conditioning system?
A zoned system divides your home into areas that have their own thermostat (think upstairs and downstairs of a home). The zoned setup lets you heat or cool specific parts of your home.