Which is the best blind to keep the heat inside in winter and keep the inside cool in the summer its for the large windows in the landing thanks

Hi Brenda,
Thank you for your question.
Usually, most blinds with blackout properties, and with a white or reflective backing will help with heat retention in the winter and keeping cooler in the summer.
If you are looking at our perfect fit pleated blinds in particular, our hive blackout range have white backings which helps reflect the heat away in the summer. The honeycomb structure that our hive blinds have also traps the air which keeps homes insulated in winter.
We do have a range of single cell pleated blinds, which do not have a honeycomb structure, which have an anti-solar coating on the back, which is meant to reflect the light back out but it is metallic in appearance. These are called ASC fabrics and can be seen on our website.
Please note that our perfect fit blinds can only go to a certain size, so if you have large windows I am not sure if you have considered just the pleated fabrics without being in the perfect fit system?
I hope the above helps however if you need any other specific advice, just let me know.