-10 20 40 02-108-1-40 -20 -40 -50 -60 10 20 99 60 80 100. 120 °C 30 50 40 Winter winds eat up cold cash Before the mercury dips, follow these tips to minimize your heating costs: Seal air leaks around windows and doors. . Caulk or seal entry points where ductwork, wiring, and plumbing are installed. Add insulation to the foundation and attic. For more energy-saving tips, visit otpco.com/SaveNow. fy OTTER TAIL POWER COMPANY -10 20 40 02-108-1-40 -20 -40 -50 -60 10 20 99 60 80 100 . 120 ° C 30 50 40 Winter winds eat up cold cash Before the mercury dips , follow these tips to minimize your heating costs : Seal air leaks around windows and doors . . Caulk or seal entry points where ductwork , wiring , and plumbing are installed . Add insulation to the foundation and attic . For more energy - saving tips , visit otpco.com/SaveNow . fy OTTER TAIL POWER COMPANY