Arrived to do a performance maintenance. Set system for heat. Measured the systems static pressure and measured a temperature split between return and supply air. Went outside and verified refrigerant levels. Verified operation of all electronic and mechanical components. Checked interior of the air handler for cleanliness. Found that the uv bulb is burnt out. Set up a time to return and replace this bulb under warranty. Verified operation of the electric heat strips and measured a temperature split for this type of heating. Replaced system filter with homeowners provided filter.