Can the company show proof of NADCA membership and certification?
NADCA provides certificates to each of its members. This certificate lists the company’s name and when their membership expires. You can also verify a company's membership status by searching NADCA's Find a Professional Directory or contacting NADCA Headquarters.
Can the contractor provide you with customer references with phone numbers for projects of similar size and scope of work which they provided service in the last year?
Contractors with experience should be able to provide relevant references.
Can the contractor provide you with evidence of the current Worker's Compensation and General Liability Insurance Coverage?
These items are standard for commercial HVAC system cleaning.
Does the contractor have written safety, respiratory, and confined space programs in addition to OSHA compliance reports?
For reference, you may want to view the NADCA Safety Manual, which covers the necessary measures companies should take as far as safety and protection.
Does the contractor possess the proper licenses that are required by your city or state to perform the work they are proposing?
Not all cities or states require licenses. Check with your local or state Department of Labor. View a list of the contact information for the department in each state that handles licenses for pesticides application, which is often required for HVAC system cleaners who use antimicrobial products.
How long has the commercial contractor been in the residential HVAC system cleaning business?
Many NADCA members provide residential and commercial services. However, some companies provide just one. If a company has just recently entered the commercial HVAC cleaning industry, they should be able to highlight recent training and education they have received.
Will the company be assigning an Air Systems Cleaning Specialist (ASCS) to oversee the project?
Each member of NADCA has one ASCS on staff; some have more than one. This certification signifies a high level of professionalism in the HVAC cleaning industry.
Will the contracting company actually do the work?
This issue should be discussed before the project begins. If they are sub-contracting the work, they still need to follow all recommended guidelines.
Will the contractor provide you with a means to conduct a visual inspection at any time during the cleaning?
Many commercial HVAC cleaning companies have the equipment needed to offer this service. NADCA suggests asking the company about this option before the project is started.