Locate the baffle handle on the outside of the furnace that controls the system’s internal valves. If you don’t know where they are, consult the owner’s manual included with your furnace or download a printable version from the manufacturer’s website if applicable. Generally, the baffle handles are close to the main housing unit of the furnace.
Make note of the baffle’s current setting: if you’re coming out of a warm season into a cooler one, mark a small notch with a marker next to the handle to show its location. This will make it easier to find the appropriate and comfortable setting when the weather starts to warm and you desire to keep the home cooler.
Find the dampers – the small circular flaps that swing somewhat loosely on a small hinge nut on the furnace’s piping. Inside the hinge is a small screw pin; manually adjust the screw by screwing toward you, which tightens the pin, or away, which loosens. Make the necessary adjustments so that the damper rests parallel to the floor, meaning the damper is open.
Adjust the damper over the course of a few days and note the temperature changes in the home and your personal comfort level. You want to find the right medium, the right balance between the two, and when you do, mark the direction of the damper with a marker. To indicate the difference between summer and winter settings, mark an "S" or a "W" at the indicators to make future adjustments easier to find.
Things You Will Need
- Phillips-head screwdriver
- Permanent marker
- Don’t forget to swap out your furnace’s filters every year to ensure proper air flow in the home. This also reduces strain on the system.