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Insulation and Air Sealing: How to Reduce the Load on Your HVAC in Fontana

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If your HVAC runs nonstop, struggles to maintain temperature, or produces uneven comfort between rooms, the issue may be your home’s building envelope. In Fontana’s hot summers and cool evenings, gaps, leaks, and under-insulated surfaces force heated or cooled air to escape—so your system works harder, cycles longer, and wears out faster. The fastest way to reduce HVAC load is to combine proper thermal insulation with thorough air sealing. Start with the attic: it’s often the biggest source of heat gain. Adding or upgrading insulation (fiberglass, cellulose, or spray foam) helps keep indoor temperatures stable. Next, seal air leaks around attic hatches, recessed lights, plumbing penetrations, and top plates. Weatherstripping and caulk around doors and windows can eliminate drafts and keep conditioned air inside. Don’t overlook ducts. Leaky ductwork in attics or crawlspaces can waste a large share of cooled air before it reaches living spaces. Seal duct joints with mastic (not standard tape) and insulate ducts to prevent heat transfer. Also check common leakage points such as garage-to-house walls, fireplace dampers, and electrical outlets on exterior walls. A good approach is to air-seal first, then insulate—so you’re not “insulating” moving air. The payoff is measurable: lower utility bills, longer HVAC lifespan, fewer hot/cold spots, better humidity control, and improved indoor air quality by reducing dust and pollutant infiltration. For best results, schedule an energy audit or blower door test to pinpoint hidden leaks and prioritize upgrades.

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