I'm in SE Georgia, near Savannah, and have no heat tube from the airbox to the heat muff. Heat muff to firewall valve only. Works fine down to about 20F but mostly just keeps your feet warm at that temp.
This fall, I'll install the seat warmers that Santa brought last year. Wires were run during construction so it won't be a big task.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ Catto 3 blade NLE, AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter,
PlanePower Alt, FlightLines Interior, James cowl & plenum
All lines by TSFlightLines
"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army