Lennox Furnace Replacement in Dundas After Defective Heat Exchanger
On October 9, 2026, AirPro Heating & Cooling completed a furnace replacement in Dundas, Ontario, after an 11-year-old Lennox high-efficiency furnace was found to have a defective heat exchanger during an inspection by another technician. An A Tag was issued, citing code sections 4.21.1 for a defective heat exchanger and 4.5.2 prohibiting the use of the equipment.
After reviewing the situation, the homeowner decided to replace the existing furnace with a new Lennox EL297UH070XV36BK, a 70,000 BTU, two-stage, 96% AFUE high-efficiency gas furnace.
The Existing Lennox Furnace
The original furnace Lennox EL296UH070XE36B was approximately 11 years old and had a 70,000 BTU input capacity, two-stage heating, and a 96% AFUE efficiency rating.
Following an inspection by another technician, a defective heat exchanger was identified. The resulting A Tag cited code sections 4.21.1 and 4.5.2, addressing the defective heat exchanger and prohibition of use.
A defective heat exchanger is a serious concern because it separates combustion gases from the air circulated through the home. When its integrity is compromised, the safe operation of the furnace can be affected.
Choosing Furnace Replacement
After learning about the condition of the existing furnace and the A Tag, the homeowner decided to replace the equipment rather than continue with the existing system.
AirPro Heating & Cooling completed the replacement on October 9, 2026, installing a new Lennox high-efficiency furnace with specifications comparable to those of the original unit.
New Lennox EL297UH070XV36BK Installation
The replacement furnace is a Lennox EL297UH070XV36BK, with the following specifications:
Manufacturer: Lennox
Model: EL297UH070XV36BK
Input capacity: 70,000 BTU
Heating operation: Two-stage
AFUE rating: 96%
Two-stage heating allows the furnace to operate at different firing levels depending on heating demand. Its 96% AFUE rating means that approximately 96% of its annual fuel energy is converted into usable heat under the applicable rating conditions.
The new unit provides a high-efficiency heating system with a capacity and efficiency rating similar to those of the original furnace.
If your furnace has been identified as having a defective heat exchanger, has received an A Tag, or is approaching the end of its service life, it may be time to consider replacement options.
AirPro Heating & Cooling provides furnace repair and replacement services in Dundas, Hamilton, Ancaster, and surrounding communities.
If you need professional assistance with an aging furnace or are considering a high-efficiency furnace replacement, contact AirPro Heating & Cooling to discuss your options.
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