I have two indoor GPs. I've read lots about keeping GPs warm when they're outside, but I'm not sure if I need to do anything special for them inside or if the ambient temperature will be fine. At the minute our house is fairly cool at night and that will become more so as we get into winter. The guinea pigs are bedded on Fitch and have a couple of boxes and a hammock in their cage, but nothing to keep the heat in really if you know what I mean. When I have tried putting bundles of hay down in the past they just trample it flat within minutes, so it's not much good for keeping them warm. Although they are both sows they generally sleep at opposite ends of the cage so they won't have the advantage of sharing body heat. I know they're covered in hair but when I'm in bed wrapped up in a duvet I feel sorry for them downstairs in a cold room!
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Mind if I hijack very quickly? 
mine are in our "sun room" (basically an old conservatory)at the moment. it isn't heated and can get quite cold but isn't drafty or damp. There really isn't anywhere else to put them right now but I'm worried.
As long as guineas are dry and free from draughts, they can cope with cooler temperatures provided they have insulation.
You can put cardboard under their newspaper (or carpet as Fernie says. We put carpet underlay off cuts between the haybox and the wall of the haybox. ).
I gave my original boars a 4'x2' cage but to prevent the judgey looks they had a box each stuffed with hay to retreat to.
Last year we had a panel-sided run.
YY to a duvet over the top too.
Mine are still out in their Pighouse with a SnugglePad tonight in their deep hay.
I got their indoor cage ready today (lots of fireworks going to be kicking off soon I reckon) so tomorrow DD and I will line it and they might be in. Our overnight temperatures are still 11-13 C (though early November looks set to change).
We keep the small bedroom (the guinea-pigs room 
) cooler . No heating on but there's no door so it'll get residual heat. There's no roof so I can't put a duvet over it.
I have some 14" panels, they have a rectangle that is 42"x28" to sleep in (fleeces) attatched to a 28"x28" square that will be hay and food.
Theory is -they eat hay,drink water,scoff food and pellets then don't drag the hay onto the fleece. If I can shake off the droppings and through out the peed paper , we might harmoniously see out winter?
What's the chances?
Aww nice to hear that your married couple are still getting along agnes
GP3 was married off in August and though they all sleep in the haybox, I think he sits at the front (to protect them and keep and eye out for food 
). He's funny when the food arrives, he goes purring off and rounds the girls up for mealtimes, even if they don't want food. He's under the thumb really.
They have another two houses , each has their 'own' preferred house.
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