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Knowledge Base

Gas Furnace

32 guidesReviewed by AC Direct Technical Team

Everything you need to size, choose, and buy a gas furnace, organized by topic. Start with sizing, then work through selection and efficiency, installation, and the practical ordering, shipping, and warranty questions.

Sizing

How Do I Size a Gas Furnace? BTU by square footage and climateGas Furnace System Sizing Working through your heating loadGas Furnace Sizing Guide The full sizing walkthrough

Selection and Efficiency

Gas Furnace System Selection Choosing the right furnaceShould I Install a Gas Furnace or a Heat Pump? Which fits your climateWhich Is More Efficient: Heat Pump or Furnace? Comparing the twoWhat Is the Highest-Efficiency Furnace You Offer? Top AFUE optionsIs a Higher-Efficiency Furnace Always Better? When it pays backWhat Does Two-Stage Mean? The two-stage comfort featureWhat Does Variable Speed Mean? The variable-speed blowerI Am Replacing My Furnace, Any Ideas? Where to start on a replacement

Installation

Can I Install a Gas Furnace Myself? What a homeowner can doCan I Install a Gas Furnace in My Attic? Attic and orientationUpflow, Downflow, or Horizontal? Match the airflow to your installDo You Provide Installers? Finding installation helpCan I Get Installation Instructions in Advance? Before delivery

Ordering and Purchasing

Why Are Your Prices So Much Lower? How direct pricing worksIs Buying a Furnace Online Risky? What to expectCan Buying Direct Really Save Me Money? The savings explainedDo You Accept Equipment Returns? The return policyHow Can I Be Sure I Am Ordering the Right System? Getting it rightWhat Is the Comfort Choice Program? The program explainedCan I Pick Up My Order at Your Warehouse? Warehouse pickup

Shipping and Delivery

How Will My Order Arrive? Freight delivery basicsWill the Carrier Unload My Order? Unloading at deliveryWhen Should I Include a Liftgate? When you need oneWill the Carrier Call Before Delivering? Delivery schedulingDo I Need to Be Home to Receive My Order? Receiving your freight

Warranty and Support

Does the Warranty Include Labor? What is coveredIs the Goodman Warranty Valid for Online Purchases? Online purchase coverageWhat If I Need a Warranty Repair? The repair processWho Do I Contact If My System Stops Working? Getting support
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