htjunkie Posted March 2, 2020 Share Posted March 2, 2020 I was told the C4 Aprilaire thermostat will not work with multi-speed fan HVAC system? I was able to use a Nest 3rd gen to work as I need a remote sensor but the sensor I always get an error with weak signals. If I was to give up using multi-speed fan, can I use the C4 Aprilaire? Appreciate your help. Quote Link to comment Share on other sites More sharing options...
msgreenf Posted March 2, 2020 Share Posted March 2, 2020 Yes but that really hurts the efficiency of your HVAC. Have you considered ecobee? Quote Link to comment Share on other sites More sharing options...
Cart Posted March 2, 2020 Share Posted March 2, 2020 As Mitch said, Ecobee is my recommendation. Great free drivers and their thermostats are great. msgreenf 1 Quote Link to comment Share on other sites More sharing options...
lippavisual Posted March 2, 2020 Share Posted March 2, 2020 Ecobee doesn't control variable speed handlers either, FWIW. Any smart stat (C4, Nest, ets.) will bypass all the variable speed and will dumb down the unit, negating any extra expense of having these systems. The only stats that work with them are from the manufacturer. Quote Link to comment Share on other sites More sharing options...
Jeffrey Posted March 2, 2020 Share Posted March 2, 2020 You may want to ask if you can have the HVAC unit handle the variable speed vs the Tstat doing this job. My unit (American Standard/Trane) has this choice. My installed advised to have the HVAC unit handle adjusting the variable speed for this very reason. Jeff Quote Link to comment Share on other sites More sharing options...
htjunkie Posted March 2, 2020 Author Share Posted March 2, 2020 Thanks for all information, this is for a condo and unit comes with 2 HVAC units for main area of the condo and one for bedrooms. Trouble is both thermostats are in the same room so the bedroom thermostat is reading the main area indoor temperature. Nest remote sensor works fine except I keep getting weak signals and not sure how to get around it! If the Nest dumps down the speed to a single speed anyway then it won't matter. I'll have to check with HVAC contractor see if he knows more information. Quote Link to comment Share on other sites More sharing options...
Neo1738 Posted March 4, 2020 Share Posted March 4, 2020 My understanding was aprilaire/C4 therm will do 2 stage but not continuous variable. Quote Link to comment Share on other sites More sharing options...
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