How can we improve Choice's Air conditioner energy saving tips?

[PhilT]

@engineer

heavy curtains

Air conditioning versus roller shutters - which is best?

Also consider honeycomb (aka cellular) blinds. Insulated cellular shades are typically considered to have the highest R-values of all window coverings.

Although either can be fairly expensive excepting for small-to-average sized standard dimensioned windows where one can buy ready made products.