furnace condensation freezing up
A non-profit club that I belong to has a furnace that has the condensation drain(clear plastic tubing) running through the wall and draining outside. We have usually only had a problem with the drain tube freezing up in extended and very cold periods(midwest winters). We installed a programmable thermostat this year and were told that we would have probably have more problems with the drain tube freezing up since the furnace probably wouldn't be running as much. We thought about putting in a condensate pump but have no floor drain or standpipe to run it to, which is why it drains outside in the first place. Someone suggested wrapping the drain tubing with some of that pipe wrap that has an electric current running through it to keep pipes from freezing, figuring that it would warm up the water enough that it should run freely. We could replace a portion of the tubing with pvc if that would work better with the pipe wrap. Looking for comments on how this would work or other ideas on how to solve this problem?