A dehumidifier will add MORE heat than a electric resistance heater
with the same power consumption.

It's obvious that all watts consumed by the dehumidifier will stay in
the garage as heat. What is not so obvious is that when water vapor
condenses into a liquid it gives up heat (just the opposite of what
happens when it evaporates). There is also the heat pump effect of
removing heat energy from the cold condensate if it is piped down
a drain.

Art

"Fred the Red Shirt" wrote in message

A dehumidifier will also help to heat the garage, just as much as
any electric resistance heater with the same power consumption.