Indoor Air Quality Services in Granbury, TX

MERV stands for Minimum Efficiency Reporting Value — it’s the standard scale used to measure how effectively an air filter captures airborne particles. The higher the MERV rating, the smaller the particles it can trap. Filters in the MERV 5–13 range handle most common household pollutants like dust, pollen, and pet dander reasonably well. For homes where allergy or asthma sufferers are present, a higher-efficiency option like Daffan Cooling & Heating’s PureAir filtration system — which uses a MERV 16 Precision Pleat filter capable of capturing particles and bioaerosols as small as 0.01 microns — offers a meaningful step up from standard filtration. The right choice depends on your household’s health needs, your HVAC equipment, and how much airflow restriction your system can handle.

In many cases, yes. The EPA has found that indoor air can be two to five times more polluted than outdoor air, and in some homes significantly more than that. Because modern homes are built to be well-sealed for energy efficiency, airborne contaminants — dust, pollen, pet dander, VOCs from cleaning products and building materials, and mold spores — can accumulate without adequate ventilation to clear them out. In North Texas, where we spend a lot of time indoors with the AC running, that recirculated air gets filtered through the same system repeatedly without always getting the treatment it needs. Daffan Cooling & Heating can assess what’s actually in your home’s air and recommend solutions based on what we find.

An air filter is a physical barrier — it captures particles as air passes through it, removing dust, pollen, and other contaminants from circulation. An air purifier goes further by actively treating the air rather than just straining it. Daffan Cooling & Heating installs the Air Scrubber Plus by Aerus, which uses ActivePure technology — a combination of UV light and a photocatalyst target — to reduce odors, VOCs, surface contaminants, visible smoke, and pet dander. For most homes, the most effective approach is layering both: a high-efficiency filter to handle particulates, reinforced by a purifier to address what filtration alone can’t. We offer both single-room and whole-home options depending on your needs.