Insulation works both ways. It traps heat inside during winter to keep you warmer. It can also trap cool inside and keep the heat out when it's hot outside. We have insulation in our rooves too, at least we're meant to, but the noises I hear in my roof with the rats playing football or wrestling would suggest otherwise. But insulation stops heat coming in and if you cool the inside of the house down, it stops the cold going out.
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PETS AND HEAT
For everyone with pets, treat them as another human. Keep them indoors during the heat of the day. If they get hot, cool them down with a fan or spray them with water.
Dogs can't sweat and if you have dogs with long hair, give them a hair cut now before it gets hot. Short front, back and sides for all dogs in hot weather but don't remove all the hair from their back because they can get sunburnt if out in the sun.
If your dog gets hot, put it in a bath with cold water and let it cool down. Have plenty of water around for them to drink as well but keep it in a shaded spot so it doesn't heat up. Most dogs will sit in front of a fan (just like people) and it will help keep them cooler.
Birds can be kept indoors and if they are really hot, use a plant mister filled with water to spray them down. You can have a fan blowing partly on their cage but not directly on their cage. Birds can lose body heat very quickly and die if they get cold. They will tolerate heat better than cold. The best place for caged birds is in a room that is comfortable for people, and where there are no cold draughts blowing over them.
Cats can be kept indoors and if they are long haired, give them a buzz cut. If they get too hot, make a cold water bottle (bottle of frozen water wrapped in a towel, dogs can use them too) for them or give them a cold bath. They won't like it but if a cat is over heating, a cold bath will help cool it down.
Other animals that are stuck outside should have plenty of shady areas to stay under. Make sure they have several containers of clean water that are also in the shade so the water doesn't heat up. Keep them calm and relaxed and they should be fine with the heat. If they are really hot, hose them off to cool them down.
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When temperatures get to 40C degrees, they are dangerous and people and animals will die if they don't take precautions. Shady areas are good, drink lots of water and try to avoid doing anything strenuous during the heat.
Give your pets water with ice blocks in. Make sure you and your pets stay hydrated. You can go through 4 or 5 litres of water per day when it's hot so drink heaps. You will sweat a lot but it's how the body cools itself down. And if you are well hydrated, you are much less likely to suffer from heat stroke.