Performed FAU maintenance on 8 year old intherm system. Cycled system for heat. Checked indoor unit electrical and system components. Vacuumed and blew out blower assembly to the best of my ability. Wiped down interior of unit. Changed out washable filter with a pleated 1 inch filter. Temperature rise across heat exchanger is within Range. Burner assembly in good condition. Wiped down unit door. Recommended homeowner sign up on ESA maintenance program. Stated unfortunately can not do it at the moment, has too many medical bills. Cycled system, system is operational upon departure.