Check your Air Filter
As your system runs, the air in your house is getting filtered. Over time, your filter will get dirty. A dirty filter should be replaced since it affects the performance of the system.
Raise the Humidity in your Home.
Wetness Equals Warmth: Homes become dried-out in the wintertime. During cold weather, increased use of your heater causes the home and its interior air to become dryer than usual. A humidifier can help add needed moisture to your home during the wintertime.
Reduce humidity inside the home.
Reducing the humidity in the home will allow higher temperatures to feel comfortable; much in the same way a hot and humid day feels hotter! Much of the excess humidity inside the home comes from humid outdoor air leaking inside. Take steps to seal unwanted air leaks such as gaps around doors, holes around wiring, and drafty windows.
Insulate your drop down attic stairs.
Heat buildup in the attic can make it's way inside the home via the drop down attic stairs. Typically, these units are not well insulated. Using an insulated cover can help prevent heat from escaping the attic and entering the home.