4. This Furnace 'Produces More Energy Than It Consumes...'

and by the way, it causes no air pollution, and results in a tax refund of twice the purchase price.

not only that, but "You have won a free trip for two...bring your checkbook to a short meeting...no obligation...and we will explain all."

HINT: The history of home construction techniques is replete with failed miracle products. Unless you like to experiment and are willing to pay for the failures, CHOOSE TRIED AND PROVEN PRODUCTS. Promotional gifts, big discounts, expensive advertising and slick sales pitches are not free - they are paid for in the price of the product.