It all depends on if you have and keep good yearly maintenance, and the temperature you like to keep in your home during the summer, and if you’re using a gas or electric heating system.

69 ℉ – 72 ℉: 9-11 yrs
74 ℉ – 76 ℉: 10-12 yrs

This can be longer, but the system loses efficiency, may incur expensive repairs, and may be out of the warranty service plan. Older systems are harder to clean, mildew may be present, and bacteria growth can spread throughout the system, which makes for poor air quality.

YES! YES! YES!

The manufacture and home warranty companies require proof of maintenance. Without it, this will void all part warranties and you will have to pay out of pocket! Plus, regular maintenance will help your system run more efficiently, save money on electric bill, find possible problems while they are still small and possibly prevent major problems that could leave you without air conditioning or heat for up to 1-3 days!