Why is my house so cold, even in the summer months

[smoothjazz2004]

I live in a 3 bed detached chalet type bungalow. It has all the insulations in the walls, roof etc, all windows and doors have been replaced with double glazing.
It is warmer outside than indoors.
In winter months it is cold in here , I have central heating.
Any ideas how to get my home warmer.