Do you have data on the ventilation units that are supplying and exhausting the compressor room right now?
If you have :
1- Supply air flow and temperature (T1) for the room. Check the informations of the supply fan if there is one. Air may be supplied by other sections of the building, then...
Depending on the cost of gas (assuming your boilers will be gas fired) and the cost of electricity in your region, and how you produced your domestic hot water before the project, there may be some savings.
If you have an inefficient gas fired (or oil fired) hot water heater heater, you may...
