[Guy]

That is some great advice. It is almost exactly how our basement air units are controlled in our 1984 Newell. I recently had to replace a 2 pole GE mechanical relay at a cost of 16.50 on Amazon. Our control box has a 12 to 24 volt control transformer, meaning our relays have 24 volt DC coils. I don't know Newells reasoning for this, but it has worked well in all three basement control boxes for 35 years.