We have a little home pressure washer. I have used it in there before, the hardest part is avoiding the plants LOL. In winter I keep the greenhouse no colder than 50F at night. If its going to be below 50, I set the heater to 55. It has automatic regulation by an air sensing thermostat that turns it on and off. Its 200,000BTU propane with a strong blower and I have HAF fans in the attic that circulate heat. Everything is getting old though, I had to replace the heater after the old one caught fire from rusting out on a 20F night. That is how I lost some of my collection. The 36 foot vent across the back used to be automatic, but the motor failed a couple years ago. It was over $1000 to replace so I never did. At some point the automatic thermostat will go by the way and I will have to either have that control system replaced, or have an electrician wire the thermostat to a manual one. The stream is shallow and ends in a still pool that is about 3 feet deep. The pond is shallow, maybe a foot deep. That big Lasia has put roots through the pond liner so I have to keep a hose on permanent drip to keep the pond full. The extra water does help keep humidity up in winter though.
