A UPVC sash window has the thermal capacity and insulation features and maintains the traditional look that so many UK homeowner love.
Replacement Sash Windows Design
UPVC Double Glazing, Double Glazed UPVC Windows
he glass actually uses two different layers so air will be found between these two layers of glass and will act as isolation against losing the heat or against the noise outside.
What about doors – https://www.upvcwindowsfitted.co.uk/upvc-exterior-doors/