How many insulation & weatherization contractors are in ONTARIO, CA?

2 with a current California license, as of 2026-08-31.

How do I check a California contractor license is current?

Every listing shows its state license number and expiry date. Verify any of them directly against the California CSLB licensee database.

Insulation & Weatherization contractors in ONTARIO, CA

2 listings

Source: California CSLB license records. Last verified 2026-08-31.

There are 2 insulation & weatherization contractors in ONTARIO, California with a current state license as of 2026-08-31. The earliest license expiry among them is 2027-06-30; every listing shows its own number and expiry date. All are drawn from the California CSLB register; expired and inactive licenses are excluded.

Business	License	Type	Expires	City	Zip
AIR CONTROL SYSTEMS INC	639003	C-2, C-20	2028-03-31	ONTARIO	91761	Set up workspace
PRO INSULATION INC	898228	C-2	2027-06-30	ONTARIO	91761	Set up workspace

Quick answers

How many insulation & weatherization contractors are in ONTARIO?: 2 with a current California license, as of 2026-08-31.
How do I check a license is current?: Every listing shows its state license number and expiry. Verify any of them directly against the California CSLB licensee database.