Adding Ductwork for a Home Addition in New Jersey

The existing air handler was sized for the original footprint. Adding 400 square feet of conditioned space may exceed what it can deliver.

A load calculation for the new area tells you whether extension, a zone, or a separate mini-split is the right answer.

Adding branches to a trunk that is already at capacity reduces airflow everywhere else. Homeowners often notice the original bedrooms getting worse after an addition.

If the trunk cannot support it, upsizing that section is part of the job.

Supply without return creates pressure imbalance, drafts and door issues. Every added conditioned space needs a return path.

Transfer grilles or jumper ducts work where a dedicated return is impractical.

Duct routing is far cheaper to solve before insulation and drywall. Bring the HVAC design into the framing conversation.

We work directly with contractors on Union County additions to lock the routing early.