Temps for our feathered friends can be one of those controversial topics in some circles, but we humans tend to equate our bird's comfort with our own, when in fact, the birds are better equipped to handle cold than we are.....they have at least three layers of feathers that they can raise individually to create insulating layers of air between the feather layers and the reason why Pipa's feet feel cold is that birds can control blood flow to their feet and by the way blood is routed through their legs.....both veins are side by side in the leg, requiring less effort to get blood to the feet and keep them warm, then there's their propensity to squat down over their legs & feet, when perching in cold weather.....I know of outdoor aviaries and breeders, in the Netherlands, of love birds where the breeder goes out every morning to break the ice in water dishes so the birds can drink.....
As long as they are shielded from wind, into the 30sF can easily be handled by most of our companion birds, excepting those that are ill or have compromised immune systems.....our winter thermostat is set at 60 degrees-F and I have been known to even turn on the A/C, when I only had a single control electric blanket.....