Editorial policy

We publish original information about heating, ventilation and air conditioning equipment. Our aim is to explain how systems work, where they are used and which published specifications affect a purchase or installation decision.

Research and accuracy

We use manufacturer specifications and primary technical resources, including government energy and indoor-air publications, to check factual claims. We distinguish rated laboratory performance from the result a specific building may achieve. Sources appear on collection and article pages where they support technical details.

Product information

Our product listings identify exact models and link to the retailer that supplied a displayed price. We record the date we checked that price. A retailer may subsequently change the price, available package or delivery terms. We do not describe equipment as tested by us unless we actually test it.

Corrections and updates

We welcome factual corrections through our contact page. We review the cited source, correct confirmed errors and update material details when we revisit an article or listing. We avoid presenting unverified announcements as current news.

Commercial relationships

Affiliate links may support our publishing. They do not change our stated technical criteria. If we publish sponsored content in future, we will identify it clearly.