I considered a heat pump but we don't need AC, the heat pump costs 3 times as much and is more involved to install and takes up room outside so I went with the resistance heater. Our electricity seems pretty inexpensive here. For my shop I will probably use gas heat.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT