Keeping a greenhouse warm throughout a NEW HAMPSHIRE winter

This is how I’m currently keeping my greenhouse a toasty 60 degrees during a New Hampshire winter. Now right now I’m not even running everything to its fullest capacity, I have my diesel heaters on the lowest setting and mainly using the propane heater as well as the woodstove.  My hope and goal is to maintain average air temperatures of 50°F throughout the coldest parts of the winter which would result in a water temperature also around 50°F. Let’s see how these heat sources hold up. Buy Luke’s Goldies Goldie bites!: https://lukesgoldies.com/products/goldie-bites-50-off-launch-sale Buy antibiotic, parasitic, and protozoal feed! https://lukesgoldies.com/products/anti-disease-medicated-flake-trio-bacteria-parasite-protozoa-killer Buy the PLUSHY BUNDLE (all three!): https://lukesgoldies.com/products/goldfish-plushy-bundle-lil-dumpy-jill-mr-cow Buy the Mr. Cow plushy! https://lukesgoldies.com/products/mr-cow-plushy-now-available Buy the Lil Dumpy plushy!: https://lukesgoldies.com/products/lil-dumpy-plushy-pre-order-sale Buy the Jill Plushy!: https://lukesgoldies.com/products/jill-plushy-pre-order My MERCH!!: https://lukesgoldies.com/collections/all The sponge filters I use: https://amzn.to/4jqPiiO