The furnace retrofit installation process can be separated into four discrete steps that will be outlined in the following sections. Generally, a homeowner will be interested in a high efficiency furnace retrofit when either an existing furnace fails or when other upgrades are being completed on the home.

Follow the flowchart below to ensure that the necessary steps are followed for an excellent furnace retrofit installation.

Step 1: Pre-Changeout

An initial assessment of the existing furnace, exhaust and ducting system, and the overall house condition and occupancy is completed pre-quote in order to establish proper furnace sizing and any ducting modifications that must be made prior to installing the new furnace. This typically includes a heat load calculation for the house.

Step 2: Installation

These details are pertinent to the day of the new furnace installation. The furnace installation must meet all Code requirements and should be installed in a manner that maximizes performance, durability and occupant comfort. Ideally, the contractor should be member of TECA⁵ and/or HRAI⁶.

Step 3: Commissioning

Commissioning must be completed by a licensed gas fitter after the furnace is installed. At furnace start-up, the necessary commissioning tests are completed and recorded to ensure the furnace is operating according to the manufacturers specifications.

Step 4: Education and Maintenance

The homeowner is provided with the commissioning checklist and manufacturer's information and then informed of the warranty and operation and maintenance procedures for the new furnace before the contractor leaves.