Saving Energy With Electric Resistance Heating

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ge, using zone heating,and regularly replacing or cleaning filtersin forced-air systems, all of which willmake your home more comfortable andefficient and will save you money.

WindowsCommon Points of Air LeakageInstead of R-value, windows are usuallyrated by their heat transfer coefficient, orU-value. The lower the U-value, the betterthe window’s thermal resistance, or resistance to heat loss.ChimneysAttichatchWindowsRecessedlightsWhile energy-efficient windows areimportant in any house, electrically heatedhomes especially should have windowswith U-values of less than 0.40. Advancedwindow designs incorporate multipleglazing layers, heat-reflective coatings, orgas fillings to reach U-values less than0.25. Installing storm windows—evenover double-pane windows—is often costeffective for homes in cold climates withhigh electricity costs. (Contact EREC formore information on ing Air LeakageYour Home’s EnvelopeBasementwindowsSillplatesDuctsThe electrically heated home should be as tight as possible. Here are somecommon air leakage points that can be sealed with caulk, weatherstripping,and insulation.InsulationAn electrically heatedhome needs to be wellsealed against airinfiltration yet allowfor adequate freshair intake.To keep heating costs reasonable, electrically heated homes should be very wellinsulated. Insulation’s ability to slow heatflow is measured by R-value (“R” standsfor thermal “resistance”). The higher theR-value, the better the insulation restrictsheat flow.However, just because you have an adequate R-value does not necessarily meanyour home is well-insulated. The insulation must be properly installed as well.Gaps and voids in the insulation—evensmall ones—create air convection orair leakage that markedly reduce ratedR-values. For more information on insulation, contact EREC.5To reduce your heating costs, your home’sexterior walls—also known as the “envelope”—need to be as airtight as possibleyet still provide healthy indoor air. Methods to achieve an airtight home are nowpracticed by many building contractors.Air-sealing measures include wrappingthe shell of the new house with an airinfiltration barrier and installing gasketsand sealants to thoroughly seal joints andpenetrations in the building shell. However, these steps are not foolproof. Complicated floor plans, irregular roof lines,protruding windows, cathedral ceilings,fireplaces, or recessed light fixtures canmake air sealing during construction difficult, if not impossible. As a result, homeswith some or all of these features oftenhave high heating costs due to excessiveair leakage.Your Home’s Duct WorkA forced-air furnace’s air ducts also influence residential air leakage. Homes withfurnaces and ducts sometimes havegreater air leakage than homes withoutducts, such as radiant-heated or baseboard-heated homes. Heat is frequently

Zone heating canproduce energysavings of more than20% compared toheating every room—occupied andunoccupied—in yourhouse.lost through leaky or uninsulated ducts.Joints between sections of ducts, betweenducts and registers, and between ductsand the furnace can lose as much as 30%of the air being moved by the blower.Leaking ductwork can create positive andnegative room pressures that oftenincrease air leakage through floors, exterior walls, and ceilings. Reducing or eliminating air leaks will make your homemore energy efficient and comfortable.The importance of airtight ducts has onlyrecently been recognized by the buildingindustry. New ducts need to be sealedwith commercial duct mastic as they areassembled. Existing duct systems can beleak-tested and sealed by an experiencedprofessional. Contact EREC for moreinformation on this.One recommended zone heating strategyinvolves controlling the centralized heating system with an automatic setbackthermostat. During the times when everyone is at home and active, the autom

However, electric furnaces can accommodate central cooling easier than zonal electric heating, because the air conditioner can share the furnace’s ducts. Electric resistance heat can be provided by electric baseboard heaters, electric wall heaters, electric radiant heat, electric space heaters, electric f

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