The building I am in has about 75 Mears Model M401 thermostats and neighbors all report similar problems to mine: we seem to have no actual temperature control. I spent yesterday and today with it and a room thermometer to find out the following: Set thermostat to about 66, yields room temp of...

I have M21 SP thermostats through the house here (built in 1978). Single pole switch. Of course the two heavy leads (Blk and Red) are for the source and the load for one side of the 220 V circuit. There is also a lighter gauge white wire. Where should that be connected in this configuration? ...

Just returned from a church with 2 new Mears line voltage (120v)thermostats. The T-stats are controlling cabinet unit heater fans with aqua-stat at coil for fan deactivation at low temperature only. They have the same problem I see above. Fans run at T-stat call, but with a set point of 65 degrees...

I have a Mears M611WT single line thermostat with thermometer. The old thermostat had a black and white wire and a copper neutral coming from the electrical box in the wall which was connected to a single pole 120/240 20 amp thermostat. The new Mears thermostat has a black and red wire and a...

We have mears thermostats controlling ceiling heat - of the 11 in the house some work marginally- the mears number on the thermostats is M22-DP - 22amp/double pole - Is there a programmable replacement for the mears antiques? If so a purchase site? Thanks