Paul saw my greenhouse and had the same things to say about it. About 25 days either side of the winter solstice, the sun is too low to even reach my property, the rest of the winter and fall and even into spring, there is not enough sunlight to count on. I've heard of people having 100F temperatures in their greenhouse in winter. That will never be the case here unless I have heating sources other than the sun.

In my defense, I have the following needs/reasons for a greenhouse.

1. My location is generally too cold to grow tomatoes easily outside. People on the bottom of the valley can do it, but I've had 1 too many years of having 30 lbs of green tomatoes on the vines to not have a greenhouse.
2. My family uses about 6-10lbs of tomatoes a week, which is a large expense, if 400$ greenhouse can cut into that expense for 3-4 months of the year, then I have a winner.
3. I knew going into it that I wouldn't have sunlight hitting the greenhouse during winter. To have sunlight hitting a greenhouse, one must first have sunlight. We average something like 8-9 days of sun during the 3 months of winter.
4. I can keep things alive inside it during the winter that would otherwise die. My greenhouse didn't freeze this year, but outside has quite a lot. Being able to keep things alive during the winter gives me better storability of certain vegetables that are more cold sensitive than others.

Paul says that it is a lot of work to take care of the plants inside of it, because you now have to water, etc etc, however, it is no different than raising livestock in a paddock system, you have to move the animals every so often otherwise your paddock is ruined. With a greenhouse, all of the manual tasks besides the initial planting (and pruning if desired), can be automated through timers and temperature based door openers. In the summer however, I can leave the doors or sides open and not have to worry about over/underheating.