The material depends on the width of the crack and what the wall is made of. Here's a table of the most common materials:
|              | Drywall           | Exterior       |
|--------------|-------------------|----------------|
| Narrow crack | Patching compound | Joint compound |
| Wide crack   | Caulk             | Caulk          |

Here are some energy auditors in New York City:
* NYS Energy Audits
* Home Insulation Experts
* Green Home Logic
* Aktobe

Please note that I do not have access to the Internet, so this data may be incorrect or outdated.
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