Buy direct from the people that know cold weather.

Amazon
9,000 BTU Unit: Buy Now
18,000 BTU Unit: Buy Now
Home Depot
9,000 BTU Unit: Buy Now
18,000 BTU Unit: Buy Now
Houzz
9,000 BTU Unit: Buy Now
18,000 BTU Unit: Buy Now
Menards Logo
18,000 BTU Unit: Buy Now
Northern Tool
9,000 BTU Unit: Buy Now
Overstock Logo
9,000 BTU Unit: Buy Now
18,000 BTU Unit: Buy Now