Not sure if this is the right forum, but our church is trying to understand how our HVAC works and could use your wisdom in helping us upgrade without having to take extra offerings. LOL! First, we have a system that was installed in 1976. It has a million and a half Btu boiler and a 50 ton air chiller. Our air handlers have two actuators each and it seems that the time clocks were taken out of the loop and replaced with toggle switches. Each station has two 110v thermostats, one has a cool/ heat switch the other seems to be a heat only (not sure)? Also each station has a manual timer in order for air handlers to energize. One of our problems lies that it gets too cold in summer or too hot in winter. Someone has to keep getting up and turn off the timer, then turn it back on. The other problem is that the thermostat (not the one with cool/heat switch) is adjusted by a member, and it bypasses the timer and will run air handlers until readjusted. Very costly! We can lock that thermostat out, but is there a device that we can install and replace the timer where its energizes the air handlers with temperature control and not with time settings? Thanks for any your replies. Your knowledge is greatly appreciated!