When is the Best Time to Turn on Your Heat This Fall?

September 26, 2025

As temperatures cool down and evenings get crisp, you might be wondering: “When should I turn on the heat for the season?” At Full Comfort Heating & Air, we’ve helped lots of folks with this question, and here’s our take.

What temperature signals it’s time

Usually, when indoor temps drop to around 64°F, that’s a good time to consider switching your furnace or heating unit on. That number keeps things comfortably warm per World Health Organization guidelines. If anyone in your home is over 65, under two years old, or has health concerns, you may want to turn it on a bit earlier.

Why waiting a little has perks

Delaying the heat for as long as it’s safely possible can save you money. Less energy used, more savings—but don’t let it drop too low. If your living space stays below ~64°F for a week, that’s a good signal that turning on the heat is safer and healthier.

What to do before you fire it up

To make sure your heating runs smoothly and efficiently, do a few checks ahead of turning it on:

  • Change or clean your air filter — a clean filter = better airflow + lower energy use.
  • Seal drafts around your windows and doors. Weatherstripping or simple fixes go a long way.
  • Move furniture away from vents so warm air isn’t blocked.
  • Add rugs or drapes to cold floors and windows — they help trap heat.
  • Test your thermostat and make sure it’s working correctly. A misread thermostat can make your system work harder than it has to.
  • Clean vents, dust registers, and ensure ducts are clear so air can flow freely.

Schedule your tune-up

Before the really cold nights set in, it’s smart to have a pro look things over. A Full Comfort technician can give your heating system a once-over — checking for things like weak components, leaks, or wear. Catching little issues early can save you big trouble (and money) later.

Why proper prep matters

A well-prepped system delivers more consistent comfort, uses energy more efficiently, and helps avoid mid-winter breakdowns — when HVAC techs are often busiest. We want you cozy, safe, and worry-free.

If you want us to check your system before it gets cold, give Full Comfort Heating & Air a call — we’ll get you set up and confident heading into the cooler weather.