Am I just being lazy / stupid??

[Fyrzowt]

We can camp year 'round here so it's hard to justify winterizing.

Here in sunny CA I tend to have that same viewpoint as well.... last year I was repairing leaks in the copper (replacing with PEX) as a result. FWIW

[Minnie's Mate]

I had the furnace set on 40F and went inside yesterday (upper-40's) and turned it up to 45F. I noticed it didn't come on. The interior temp, despite being a very windy day, was 51F. I also have all the cabinet doors open and there is a vent in bathroom.