Glossary
MERV Rating (Minimum Efficiency Reporting Value)
Definition
MERV ratings measure how effectively an air filter captures particles from the air passing through it, on a scale from 1 to 20. Residential HVAC systems typically use MERV 8-13 filters. Higher MERV ratings capture smaller particles but also restrict airflow more, so the filter must be matched to the system's specifications.
Understanding MERV Rating (Minimum Efficiency Reporting Value)
MERV 8 filters capture dust mites, pollen, and pet dander. MERV 11-13 filters also capture mold spores, fine dust, and some bacteria. MERV 14+ filters approach HEPA-level filtration but can damage residential HVAC systems not designed for them. Shipshape tracks filter replacement intervals and alerts homeowners when a change is due, since a clogged filter is the #1 cause of preventable HVAC failures.
Related Terms
Home Health Score
A Home Health Score is a 0-100 numerical rating that represents the overall condition of a home's critical systems. Generated by Shipshape's AI after a Home Health Assessment, it gives homeowners and service professionals a clear, at-a-glance view of what needs attention now, what can wait, and what is in good shape.
Proactive Home Maintenance
Proactive home maintenance is the practice of monitoring, inspecting, and servicing home systems before they fail, rather than waiting for breakdowns to occur. According to U.S. Department of Energy data, proactive maintenance reduces repair costs by up to 40% compared to reactive approaches.
Delta-T (Temperature Differential)
Delta-T is the difference in temperature between two measurement points in an HVAC system — typically the supply air temperature minus the return air temperature. A healthy AC system typically shows a Delta-T of 15-20°F. Readings outside this range indicate problems such as low refrigerant, dirty coils, or airflow restrictions.
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