In the spirit of full disclosure…. 🙂
Was -7.2C here last night (still -3.2C by 9:15) with a very heavy hoarfrost/fog in the early hours.
Looked in dome at 11:00 – by which time the air was registering as +5C – and found some condensation on the mirror.
Well , there goes my theory….
So, henceforth will also use a dew heater band near the secondary plus the fan. Can’t help matters having frost on the inside of the tube some nights. Don’t want to use too much power though.
