Attic insulation provides a barrier that inhibits energy loss from the interior of your house to the exterior. It also protects your home when the outside temperature gets to an extreme level during both summer and winter. As the majority of hot and cold air enters and exits through the roof, attic insulation is vital. Fiberglass batt is considered to be the best insulation for heat pump austin texas. Compared to other insulation materials, it is the cheapest and easiest to install. Fiberglass batt is also incredibly energy efficient, as it helps to slow the spread of hot and cold air.