Bed bugs on the Walls/Ceiling

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Hi - I started seeing bed bugs on the wall and ceiling in my living room a few weeks ago. Initially I didn't know what they were so I was just vacuuming them up.   A few days ago I finally used a bug identifier app and learned they were bed bugs.   I haven't seen a swarm yet, I just see one or two everyday.  I have a professional bed bug exterminators come in to assess the situation today and tomorrow. 

The question is, assuming I go for the heat treatment, will the entire house need to be treated?  I got 3 quotes - they're all expensive, but something in the line of $700-1400 for the first room ($1400 incl. kitchen/living/bath as well) then $300-400 for ea additional room.  So for the entire house I'm looking at $2,000 or more for 1,050 sqft house.   My priority is that I eliminate them completely before the situation gets worse, but I'm concerned that I spend all this money and it's not effective (bed bugs come back) and I'd have to do it again.  

Any recommendation?  And I should go for heat treatment, not chemical, correct?