Nothing new, but…
EFFECTIVE JUNE 30TH 2015
The Fifth Edition of the Florida Building Code (FBC) requires blower door testing for all residential dwelling units. This would include single family houses, town houses, duplexes and each condominium and apartment unit where the building is three stories or less.
R402.4.1.2 Florida Building Code - Energy Conservation
Requires blower door testing to confirm air leakage not greater than 7 air changes per hour. Testing must be done by an approved third party, and report provided to the building official.
R303.4 Florida Building Code - Energy Conservation
Requires a whole house ventilation system meeting M1507.3 when the air infiltration rate is less than 5 air changes per hour. (Which is what R402.4.1.2 above requires, thus all houses must have a whole house ventilation system.)
R402.4.1.2 Testing. The building or dwelling unit shall be tested for air leakage. The maximum air leakage rate for any building or dwelling unit under any compliance path shall not exceed 5.0 air changes per hour or 0.28 cubic feet per minute (CFM) per square foot [0.0079 m3/(s × m2)] of dwelling unit enclosure area. Testing shall be conducted in accordance with ANSI/RESNET/ICC 380, ASTM E779 or ASTM E1827 and reported at a pressure of 0.2 inch w.g. (50 Pascals). Where required by the code official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope have been sealed.
And I’ve seen such testing find tremendous low hanging fruit, to reduce energy cost for the owners.