https://www.sms-cpq.com/
SalesMadeSimple maintains a large database of HVAC items & AHRI Certifications. Several distributors subscribe to this service to enable their Sales Reps to assist their contract customers with match ups. Several customers have considered extending this functionality to their eCommerce site and enabling their end users to self-serve in a similar manner.
Thanks Adam for the idea, we will look into it and will get back in case of more details required.