Customer wasn’t home, was given door code. Upon arrival I went to first floor unit and removed all refrigerant. Replaced bad txv with new one. Pressurized unit to 350psi nitrogen and checked for leaks. Pressure held, no leaks found. Removed nitrogen and vacuumed system down to 500micron and held. Added factory charge of 11.6lbs of 410a then returned power to system and ran ac. Checked Superheat, subcool, and delta air temps. Unit is operating normal. Then I went to each thermostat and replaced the Nests with Honeywell T6 WiFi thermostats. Configured thermostats for dual fuel operation where Gas Furnaces are enabled at 40 degrees and Compressor Lockout is enabled at 35 degrees. Set all schedule periods for 78 cool 68 heat until customer sets up their own program. Left thermostat boxes on dinner table with Nest thermostats inside each box. Also included in the box is the WiFi setup booklet. WiFi needs to be setup by homeowner, I cannot set this because customer needs to use their own e