Whether you're replacing an old HVAC system in your current home or installing a new system in the home you're building, you've probably encountered the terms Manual S, Manual D, and Manual J. These are important components in finding the best system for your home. They're also frequently confusing terms to understand, so here's what you need to know:
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Purchasing new heating and cooling equipment entails a lot more than simply picking out the first energy-smart system you see. In order to actually enjoy the efficiency benefits, a professional load calculation must be performed to determine your home's 