Timber Frames are highly insulated and achieve very low U-Values (a u-value is a measure of thermal performance, with lower values being better). Field Studies have shown that Timber Frame insulation correlates with the calculated U Values, while Partial Fill Cavity insulation (Masonry) can be up to twice the calculated U Value.
As timber is a natural insulant, timber frames also minimise heat loss through thermal bridging, which can be problem in other forms of construction. Timber frame also have very good airtightness which eliminates drafts and further improves thermal performance
In addition, timber frame has a faster thermal response than concrete, this means the house comes up to temperature faster. In a masonry house, it can take quite some time to heat, as block needs to be warm before the house comes up to temperature.