THAILANDSICThailand Standard Industrial Classification

TSIC Activity

43223

Air conditioning and ventilation installation

ประกอบกิจการให้บริการซ่อม ล้าง ติดตั้ง เครื่องปรับอากาศทุกชนิด

What this activity covers

Companies in this sector install, maintain, and repair air conditioning and ventilation systems.

  • Ventilation system installation — Installation and maintenance of ventilation systems in buildings
  • Air conditioning installation — Installation and maintenance of air conditioning systems
  • System alteration and repair — Modifications and repairs of existing ventilation and cooling systems
  • Piping installation — Installation of connecting pipes for ventilation and cooling systems
  • Maintenance services — Regular maintenance of air conditioning and ventilation systems

What companies here also do

Seen in real company registrations under this code — beyond the official definition, so licensing may differ.

  • Manufacturing cleanroom panels — Production of panels for cold rooms and cleanrooms
  • Dust management equipment installation — Installation of equipment for managing dust in ventilation systems
  • HVAC system design — Designing heating, ventilation, and air conditioning systems

Foreign ownership

List 3: Restricted, FBL/BOI route availableinherited from 43

Construction, except construction of infrastructure providing basic public services in public utilities or transport that requires special apparatus, machinery, technology or expertise, and except other categories prescribed in ministerial regulations

The infrastructure carve-out is subject to a minimum foreign capital requirement, subject to capital thresholds, verify current figures.

FBA B.E. 2542, List 3 (10)Routes: Foreign Business Licence, BOI promotion, US Treaty of Amity

Auto-mapped, verify against the Act. These TSIC mappings are indicative, not legal advice; the schedules of the Foreign Business Act B.E. 2542 are the authority. See the full foreign ownership reference.

Industry at a glance

as of 23 ก.ค. 69

The whole registered industry under this activity, every registration year, from the DBD DataWarehouse.

2,885
active companies operate here
฿6.3Bregistered capital, combined
฿43.8B
Sector revenue · 2025
+15% since 2023
฿2.2B
Net profit · 2025
1,329 profitable
202320242025

net profitrevenue

Foreign investment

new registrations · 2026 YTD
8%of new registered capital is foreign-held
฿11.5M foreign฿125.4M Thai

Largely domestic, with some foreign investment.

2 of the 5 largest companies here are foreign-owned Thailand subsidiaries.

New in 2026

140+2.9%

registrations, YTD

Registered capital

฿6.3B-3.7%

since year-end

Largest by registered capital

  1. 1COOL CONNECT CO., LTD.Bangkok฿200.0M
  2. 2Blue Energy System and Technology Co., Ltd.Bangkok฿150.0M
  3. 3Jardine Engineering Co., Ltd.Bangkok฿120.0M

Source: Department of Business Development DataWarehouse. Financial figures are combined totals of companies that filed statements; revenue and profit shown for the latest three reporting years.

Companies registered since 2022

Browse all

New DBD registrations under this activity since 2022, the period the registry snapshot covers, not the full historical register.

902
Registered
since 2022
856
Still active
46
Dissolved
฿1.0M
Median capital
of active

New registrations per year

2022peak 232 in 20222026

Largest active companies by registered capital

Source: Department of Business Development (DBD) new-registration records, 2022 to present. Counts cover companies first registered in that window, reflect the latest snapshot load, and may lag the live register.

Emerhub

Restricted activity? There is usually a route.

Emerhub structures foreign-owned companies around FBA restrictions: Foreign Business Licence applications, BOI promotion, and compliant shareholding structures. Talk through your case before you commit to one.

Talk to Emerhub Thailand