What are the Low Nox Furnace Requirements for Colorado in 2026?

Starting January 1, 2026, Colorado will implement strict ultra-low emission standards for residential gas furnaces as part of the 2026 Model Low Energy and Carbon Code and HB23-1161. Under these requirements, all new gas furnace installations and replacements statewide must meet an emission limit of 10 ng/J (nanograms per Joule) or less.

Key details regarding these requirements include:

Scope: The regulations affect all gas furnace sales and installations across the state, ensuring uniform standards to reduce building-related pollution.

Penalties: Non-compliance with these environmental standards can result in civil penalties of up to $2,000 per violation.

Financial Impact: While the equipment must meet higher standards, homeowners may benefit from energy savings of up to 20% and construction efficiencies ranging from $3,900 to $6,750. Additionally, state-funded incentives and rebates from local utilities are expected to be available to help offset the costs of upgrading to compliant models.

Exemptions: Certain older buildings or specific types of renovations may qualify for exemptions to ease the transition to the new standards.


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