Glossary
R-Value (Thermal Resistance)
Definition
R-value measures how well insulation resists heat flow. Higher R-values mean better insulation performance. The U.S. Department of Energy recommends R-38 to R-60 for attic insulation and R-13 to R-23 for walls, depending on climate zone. Inadequate insulation is one of the top causes of energy waste in homes.
Understanding R-Value (Thermal Resistance)
R-value is determined by the insulation material, its thickness, and its density. Fiberglass batts typically provide R-3.2 per inch, spray foam R-6.5 per inch, and cellulose R-3.7 per inch. Over time, some insulation types settle or degrade, reducing their effective R-value. A Home Health Assessment evaluates insulation condition as part of the overall home efficiency analysis.
Related Terms
Home Health Assessment
A Home Health Assessment is an AI-powered digital inspection that evaluates the condition of a home's major systems and generates a comprehensive report with a Home Health Score. Shipshape's assessment uses a 25-point guided survey plus AI image analysis to identify issues, estimate remaining equipment life, and recommend preventive actions.
BTU (British Thermal Unit)
A BTU is the standard unit of measurement for heating and cooling capacity. One BTU is the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit. HVAC systems are rated in BTUs per hour to indicate how much heating or cooling they can deliver.
Home Energy Audit
A home energy audit is a professional assessment that evaluates how much energy a home uses and identifies opportunities to reduce consumption and costs. Audits typically include blower door testing (to find air leaks), infrared thermal imaging (to locate insulation gaps), duct leakage testing, and analysis of HVAC equipment efficiency.
Learn more about Intelligent Home Management
Read the definitive guide to how AI and smart sensors are transforming home care.
Read the IHM Guide