Replaced thermostat that customer provided. Thermostat is operating and was paired to customer phone. Did a heating tune up as well. Passed on carbon monoxide when venting out. Temp split on system is passing. All electrical components are passing for manufacture specifications. Did an inspection on heat exchanger there were no cracks or leaks. Did notice when checking blower wheel a lot of dust has accumulated on the wheel. Will recommend a blower wheel cleaning as well a duct cleaning. Did clean flame sensor and pressure switch hose. System is up and running before departure. Thank you for choosing LBA services-Johann