You could wrap some insulation around the intake pipe for the first 10’. I assume you have fibreglass batts and poly in the joist space/exterior wall area. Push and notch the insulation around the pipes and back against the exterior wall. Then clean up the poly with tuck tape, and do your best to tape it to the pipes. As well, you can add some accoustic-seal(goopy tar-like caulk), to reattach poly to the lumber. On the exterior, silicone is usually the best option for where the pipes pass through.
Honestly, your HVAC guys should have done all that for you before they left, as that is kinda crap incomplete work.
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