Is Unknown (unable to uniquely identify a specific HVAC operating company matching the exact name) owned by private equity?

Notes

• Registry escalation attempt (Washington): The Washington Secretary of State Corporations & Charities Filing System (CCFS) business search is primarily a JavaScript application; in this pass, I could not successfully retrieve specific, citable entity records (legal name/UBI/registered agent/officers) for “Wolff & Son Heating & Air Conditioning” from the official WA CCFS system within the available tooling constraints.
• Most concrete public-record-style reference found remains Spokane County Project Activity Report entries listing “MORRIS D WOLFF & SON” at 55 E Lincoln Rd, Spokane, WA 99208 as a contractor on residential projects; the report does not identify the contractor as “Heating & Air Conditioning,” provide a legal entity type, UBI, or ownership details, and it appears more consistent with a construction/homebuilding contractor than an HVAC service company.
• Non-official directory pages and miscellaneous web results returned many near-name collisions (e.g., Wolff & Son Electric; Wolf & Sons; Wolff & Son Construction; etc.) across different states and industries, without a clear tie to an HVAC operating company named exactly “Wolff & Son Heating & Air Conditioning.”
• Because the operating company cannot be uniquely identified and no acquisition/portfolio/SEC/press-release evidence ties the target name to a PE sponsor, ownership remains marked uncertain rather than asserting not private-equity-owned.
• Multiple web searches for the exact company name did not surface an official website, corporate registry profile, or acquisition/portfolio announcement tying an HVAC company with this exact name to any owner (including private equity).
• The only close match found in primary-ish public records is a Spokane County project activity report that lists “MORRIS D WOLFF & SON” as a contractor (address in Spokane, WA), but it does not identify the business as “Heating & Air Conditioning,” provide a website, or contain any ownership/PE information.
• Because the company cannot be confidently resolved to a unique operating entity, any conclusion about PE ownership would be speculative; therefore ownership is marked uncertain.