Heat pump tumble dryers are super-efficient, but to save the most energy, programmes may take a little longer to dry your clothes than on standard dryers. It's important not to overload the drum either, so they can perform at their best.Tired of decorating your home with damp laundry? Then you'll love this Samsung Series 9 heat pump tumble dryer. Don't worry about shrinking those shirts, as it's kitted out with OptimalDry sensors that change the drying time to match what's inside.