Wednesday, October 21, 2009

Greenhouse update - First heater night

We are certainly feeling Fall here in Oklahoma.  A couple of cool fronts have swept through over the last week, moving the overnight lows into the 40s.

After getting the greenhouse roof in place and the door hung, I moved all of my plants into the greenhouse on Saturday and they spent their first night in their new home Saturday night, with an overnight low of 40 F.  My greenhouse stayed just below 60, with the heater kicking on and off during the night.  The next day I adjusted the thermostat to keep the greenhouse a little warmer, and the following night the temperature dropped to just about 53 and the heater kept the greenhouse between 61 and 62 all night.  Over the last two nights the heater has not had to come on and the greenhouse has stayed about 3 or 4 degrees warmer than the overnight low.

Temperature over the last 72 hours in my greenhouse
The plot above shows a sawtooth pattern when the heater is kicking on and off.  You can see the night when my heater came on 12 different times over a 9 hour period.  The following two nights the temperature gradually decreased, but never low enough to trigger the heater.

I should mention that I am still not finished with the greenhouse.  The soffits are still open, so I have simply stuffed a couple towels in the gaping holes to keep air from leaking out of the eaves for the time being.  I should get the soffits attached later this week.

Also, I just finished the trim around the door and put weather stripping in place on Monday, which probably helped the greenhouse stay warmer over the last two nights.

I still haven't had a big test with a freeze outside, but I feel pretty confident now that with the soffits in place, my heater will keep the interior right around 60 degrees, which will make my plants very happy.

Stay tuned for pictures of my finishing touches and the plants in place!

See other phases of the project here:

1 comment:

  1. What are you using to monitor temps in your greenhouse?