Heating the greenhouse is a 'h2ot'
topic this winter (probably most winters). I've copied some of the e-mails that we've been passing around: 1.What is the best (and most
economical) way to heat my greenhouse? 2.A low power, inexpensive, heater solution? 3.What material to
use to insulate the base of the greenhouse that won't rot? R-board?