Performed heating tuneup for Lennox furnace. Checked all safeties and connections. Checked filter. Also checked pressure switch as thermostat was showing a history of pressure switch failures. Homeowner also wanted to zone the upstairs loft, but due to the ducting being too small, we will not be able to do so with the current system they have. System is operational at this time. Homeowner signed up on super hero club membership and has one more visit left.