Climate control? The Bonaire Durango evaporative cooler keeps the greenhouse and aviary around 85 degrees during the hot summers.
Greenhouse alternative? You can create a similar growing environment with a raised bed garden. During the winter you only need a sheet of plastic or glass. 3’x4’x4’ is a good size for outdoor carrots, celery, garlic, cilantro, parsley, scallions, and cabbage. I have three raised bed gardens with all these items growing and thriving. Since this is a more long-term growing bed you can start with dried leaves, sticks, tree trimmings, straw, which will slowly decompose over time and provide nutrients. Cover with a raised bed soil.
Tomato seeds or clones? There is no wrong answer, yet once you have established your favorite varieties of indeterminate tomatoes you can avoid planting seeds in the future by cloning your tomatoes. Take a sucker, 12 inches or smaller, from your tomato bushes and place it in a tall bottle of water for a month or two until the roots have sprouted sufficiently to transplant it into a 3-5 gallon pot. The transplant technique I use is to dig a deep hole into the pot, set the rooted tomato plant in the center with one hand and gently pour water around the hole to cause the soil to gently surround the roots in a more natural way as to not harm them. I never use my hands or pack the soil. The action of the water does all the work! Mix in the nutrients before you dig.