How to Improve HVAC Efficiency: What Works, Ranked by Return

by LEGOM Technical Team | Oct 15, 2026 | HVAC

Most advice on improving HVAC efficiency arrives as an undifferentiated list. Change your filters, seal your ducts, get a programmable thermostat, upgrade your equipment. All of it is reasonable, and none of it tells you where to start. The measures differ enormously...

PM2.5 Levels in Major Cities: How to Read and Compare Them

by LEGOM Technical Team | Oct 15, 2026 | Air Purifier

Looking up PM2.5 levels in major cities is easy. Understanding what you are looking at is harder, and it is where most people go wrong. Open two different air quality apps for the same city at the same moment and you will often see two different numbers. Neither is...

HEPA Air Purifier Wholesale: Sourcing for Haze-Prone Markets

by LEGOM Technical Team | Oct 15, 2026 | Air Purifier, HVAC

As an HVAC manufacturer and wholesale supplier, we watch demand for air purifiers move in two very different patterns, and the distributors who do well understand both. The first is a slow structural rise. Urbanisation, post-pandemic awareness of indoor air, and...

Heating System Valve Types Explained: Which Valve You Need

by LEGOM Technical Team | Oct 13, 2026 | Plumbing

A domestic heating and hot water system contains somewhere between eight and twenty valves, and almost none of them are interchangeable. They look similar, several share the same thread sizes, and two of the most important ones share an acronym while doing opposite...

Underfloor Heating Zones: How Many You Need and How to Plan Them

by LEGOM Technical Team | Oct 11, 2026 | Underfloor Heating

Zoning means dividing a heating system into areas that can be controlled independently. Each zone gets its own thermostat, and each responds only to what that part of the building actually needs. The appeal is obvious enough. You heat the rooms in use rather than the...