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Gas Furnace Replacement

Installed correctly, a new gas furnace can cut utility expenses while improving comfort.

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Checklist

This U.S. Department of Energy checklist includes important specifications that can contribute to a complete and quality installation. All work shall comply with these specifications, all relevant codes and standards, and all manufacturer installation instructions. The contractor shall check each box on the checklist below and sign and date at the bottom to certify the work is completed.

Preparation
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All exposed ducts (e.g., attic, basement, and crawlspace) shall be inspected; all damaged or disconnected ducts shall be repaired or replaced and all visible leaks shall be sealed with UL 181 tape and/or mastic.
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A room-by-room load calculation shall be performed as described in the Air-Conditioning Contractors of America (ACCA) Manual J.
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The gas furnace selected shall be ENERGY STAR certified and sized in accordance with ACCA Manual S based on ACCA Manual J load calculation results.
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The system shall be evaluated to determine if the supply and return air flows are balanced and if ducts are properly sized.
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Recommendations shall be made to the homeowner if the ducts are not the right size.
Installation
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All equipment shall be installed in accordance with ANSI/ACCA Standard 5 HVAC Quality Installation Specifications.
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Correct air flow through the furnace, firing rate, and temperature rise shall all be verified.
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The air filter shall be replaced with a MERV 8 or higher filter selected for appropriate air flow across the coil.
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If the air filter is installed in a filter box attached to the air handler, the filter access panel shall be fitted with a flexible, air-tight gasket.
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Where a new thermostat location is provided, it shall be located on an interior wall away from heating or cooling registers, appliances, lighting fixtures, exterior doors, skylights, windows, and areas that receive direct sunlight or drafts.
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If installing a direct-vent gas furnace results in an orphaned gas water heater still connected to an existing chimney that may now have inadequate draft to remove the water heater combustion emissions, the contractor shall inform the homebuyer of necessary remediation steps (e.g., installing a chimney liner) to provide proper venting and code compliance.
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If installation of a new furnace results in a vacated entry point in the chimney, the hole in the chimney wall shall be sealed.
Commissioning
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Pressure balance testing (pressure pan and/or flow hood) for proper room-to-room air flow shall be performed and adjustments shall be made to address any imbalances.
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Air flow across the coil shall be tested following procedures approved by ANSI/ACCA Standard 5 QI-2015 to verify it is within the CFM range specified by the equipment manufacturer. If it is not, adjustments shall be made as required.
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The home shall be inspected for the presence of a whole-house ventilation system. If one is present, the actual air flow shall be tested and verified to meet or exceed a target ventilation rate based on house size as follows: 50 cfm for up to 1,500 ft2, 70 cfm for 1,501 to 2,500 ft2, and 100 cfm over 2,500 ft2, per ASHRAE 62.2-2013. Recommendations shall be made to the homeowner for either installing a new whole-house ventilation system compliant with the target rate if one is not present or repairing an existing system to be compliant with the target rate if airflow is not adequate.

Gas Furnace Replacement Background

Gas Furnace Replacement

Systems for heating and cooling your home cost more money and use more energy than any other system in your home – typically over 50% of your utility bill. High-efficiency gas furnaces such as two-stage and modulating systems save energy and last longer. However, a quality installation is integral to a well-performing system. Nearly half of all heating and cooling systems in U.S. homes are not installed to manufacturer’s instructions and therefore perform below rated capacity and efficiency.

Tips to Sell Quality Installed Home Improvements

Home Improvement Expert is a valuable tool for organizations committed to quality installed work. The following tips help optimize the value of this tool when selling home improvements:

Trust Matters: Inform homeowners how your work conforms to this world-class expert guidance. Recommend they visit the DOE website as evidence these are indeed official best practices.

Knowledge Matters: Take advantage of the Building America Solution Center as a resource for becoming an expert on these projects.

Clarity Matters: Tell prospective clients to contrast your expert-recommended best practices with other contractors.

Value Matters: Advise prospective clients to insist other bids also include these checklists to ensure equivalent quality work.

Message Matters: Showcase on your website and marketing materials that your company uses the highest quality best practices specified on HIE Checklists.

Experiences Matter: Provide visual evidence contrasting the difference between poor and high quality work such as infrared images; pre- and post-energy bills; short and long warranties; and simple charts and graphics depicting performance advantages.

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Combustion Furnaces

Guide describing combustion furnaces with compliance and installation guidance.
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