Fla. Stat. § 489.103 — Exemptions
Any person who sells, services, or installs heating or air-conditioning units which have a capacity no greater than 3 tons or 36,000 Btu, which have no ducts, and which have a factory-installed electrical cord and plug.
(15)
The installation and maintenance of water conditioning units for domestic, commercial, or industrial purposes by operators of water conditioning services. No municipality or county may adopt an ordinance, rule, or regulation which requires such an operator to become licensed, certified, or registered as a plumber or which otherwise prevents the installation and maintenance of such water conditioning units by an operator.
(16)
An architect or landscape architect licensed pursuant to chapter 481 or an engineer licensed pursuant to chapter 471 who offers or renders design-build services which may require the services of a contractor certified or registered pursuant to the provisions of this chapter, as long as the contractor services to be performed under the terms of the design-build contract are offered and rendered by a certified or registered general contractor in accordance with this chapter.
(17)