The furnace ignites and warms; I see theblue flame through the site glass. The blower motor turns on and distributesair into the ducts, I feel air flow from various vents in the house, the greendiagnostic light stays a constant green, indicating no system issues, However,the air flow through the vents doesn’t heat.

coleman model# DGAA090BDTB

Any Ideas?

Make sure the air filter is clean.