Sorry to hear that they don't have the Flir.
You actually would depressurize the house with the fans blowing out because this causes air to get sucked in through the gaps making them more visible because the air flow will travel over the surfaces the air is coming in through. The fans I'm going to use are standard 2 foot by 2 foot(roughly) box fans. I have slider windows so I open the window to the width of the fan and use cheap painters plastic sheeting(cardboard or most other solid things that can be cut to size work too) and tape to seal the gap at the top. You could probably manage to get enough air flow with 2 box fans in place into whatever window(s) that you can fit them into the easiest.
This is great for after you get the place but it still helps you to use a thermal camera even if you don't have the ability to depressurize the house because you will still be able to see large voids where insulation should be because they will show up as colder spots.
Good luck.
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