Not bad, better than I could do. Just for the record, using the formula: F = (9/5) C + 32 converts 20 degrees C to 68 F so that is about what my indoor thermostat is set at and actually quite warm for this time of year; here in Virginia just across the Atlantic we have had nights at 40 F already so my frame gets pretty cold overnight in an unheated garage.

Don Shillady
Retired Scientist/teen rodder