This will help maintain its efficiency. Clean permanent filters once a month with dishwashing detergent, rinse thoroughly and let them dry before replacing. This allows a free airflow, reducing stress on the fan. It also keeps the coils clean leading to lower operating costs. High water pressure may be shortening your faucets life.
Digital thermostats save energy through pin-point accuracy.
Have your steam boiler checked and skimmed once a year. Vents and traps should be checked and replaced as needed. Conserve energy, keep your windows and storm windows closed for summer and winter. Open fireplace dampers can rob your home of conditioned air and comfort. Move lamps and lights at least 5 feet away from thermostats.