When I use my RCAC the temperature is quite comfortable in the home, but once switched off the home becomes hot or cold very quickly. What is wrong?

When I use my RCAC the temperature is quite comfortable in the home, but once switched off the home becomes hot or cold very quickly. What is wrong?

This may be due to lack of insulation in your home. To prevent such losses, make sure that your home is energy-efficient – insulated and draught-proofed with thick window coverings – before calculating your cooling/heater needs. 

Have a draught-proofing or insulation professional assess your home’s efficiency and insulate or seal any areas prone to heat loss.