Our home is large and almost 10 years old. We had a reputable dealer design the heating and install 2 Lennox Variable Speed High Effiency Furnaces. They have been very cost effective for fuel bills, but we have endured several very expensive repairs on both furnaces. The electronic boards that control everything seem to be defective and the replacements aren't any better. We are currently looking at another $1000 repair bill. Lennox is not helping because our dealer (small towns) isn't selling Lennox much anymore--guess why??? We feel stuck. Any suggestions?