American-made since 1964
HVAC products built by installers, to save installers time.
Honnecke Manufacturing designs and builds furnace, A/C, electrical, and plumbing products from G90 steel — engineered for fast installs, easy service, and fewer callbacks.
Designed by contractors
Every product comes from real install problems — built to adjust to unique jobs and cut time on site.
G90 steel, made in the USA
Domestically sourced materials and local labor in Golden, CO. Patented designs you can trust.
Support that picks up
Spec files, install videos, training, and a real person on the phone. Bulk and wholesale pricing available.
Our products
View all →Furnace & A/C Ducting
Classic Return Air Box
The core of a fast, serviceable furnace install.
Learn more →Coil Spacers
Coil Transition (Coil Spacer)
Lower static pressure, longer equipment life.
Learn more →Furnace & A/C Ducting
Side Air Filter Box
Side-return filtration that fits tight mechanical spaces.
Learn more →Ready to spec your next job?
Get a quote, request spec files, or talk through an install with someone who knows the products. Bulk and contractor pricing available.