Performed 4 system heating maintenance. Checked filters for upstairs and main level, both 20x25x5 media filters still in good condition. Will need to replace on next visit. Basement system filter was recently replaced, left new one with customer. Blew out filters for mini-split system. Cleaned flame sensors for upstairs and main level system, checked operation and systems operating properly. Basement heat pump system clean and performing properly. Installed UV light for upstairs system and the bulb was bad. Will need to install new bulb with module. Customer has paid for UV light for upstairs system.