Looking for a Manual J calculation in Hattiesburg, MS? Describe your project once and up to three HVAC designers who work in Hattiesburg and Forrest County get back to you with a quote. It's free and there is no obligation.
Hattiesburg is home to about 48,522 people (2024 Census Bureau estimate), a stable community (−0.4% since 2020). With 908 people per sq mi, it is a semi-rural area. HVAC permits here increasingly require load calculations, especially for new homes and heat pumps.
Hattiesburg at a glance
- Population (Census Bureau estimate, 2024)
- 48,522 (−0.4% since 2020)
- Rank in Mississippi
- 4th of 299 cities and towns
- Land area
- 53 sq mi
- Population density
- 908 people per sq mi (semi-rural)
- Type
- City (Hattiesburg city)
- Main county
- Forrest County
What to check before hiring in Hattiesburg
- Requirements: in Mississippi, ask the building department what report format it expects.
- Inputs: accurate plans and window data make the calculation reliable.
- Volume: builders can often get pricing for several homes.
- Price drivers: home size, number of zones and whether S and D are included.
Useful official resources
-
ACCA: Air Conditioning Contractors of America
Official information and guidance.
-
ICC: International Code Council
Official information and guidance.
Services available in Hattiesburg
-
Manual J load calculation
Room-by-room heating and cooling load calculation for the HVAC permit.
-
Manual S and D equipment and duct design
Equipment selection and duct design from the load calculation.
Frequently asked questions in Hattiesburg
How much does a Manual J cost in Hattiesburg, MS?
It depends on the home and the reports needed. Describe your project: designers who serve Hattiesburg reply with a quote.
How long does it take?
Often a few days once plans are received.
Can it be done remotely?
Usually yes, from plans and specifications.
Which HVAC designers will contact me?
Up to three independent HVAC designers who serve Hattiesburg and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.