OptiChill
Machine-learning control for cooling systems
Winner — New Regional Startups Platform
A software platform that raises efficiency and saves energy in cooling systems, using adaptive control for chillers and cooling towers.
“ALL YOUR SOLUTIONS MADE EASY”
Complete HVAC and building engineering solutions
Design, installation, control and maintenance to international engineering standards
HVAC booksLoad calculatorsDesign servicesConsulting
HVAC design and installation to engineering standards
A professional engineering team, from design through to maintenance
Our services
Free calculators for engineers and technicians
Cooling load, energy, duct and pipe sizing. Ready to use, no sign-up.
Try the calculatorsAbout
A complete HVAC and building engineering company founded in 2025 in Phayao — from design, installation, control and maintenance through to energy consulting and engineering software, trusted by public and private organisations nationwide.
Vision and missionDesigned with knowledge. Installed to standard. Cared for with attention.Company historyHow the company began and how it has grown.Our strengthsWhat makes clients choose us, and come back.Organisation chart and expertsThe people behind every project we deliver.Organisations that trust usPublic and private organisations we have worked with.Awards and achievementsWork recognised beyond our own walls.
Our services
HVAC systems
Design, installation and maintenance of every type of air-conditioning system for buildings, offices, factories and workplaces.
View detailsWorks
Our experience
Selected projects by our company and team, across project consulting and software.
Training
Training Programs
HVAC engineering training with CPD units, in collaboration with the Faculty of Engineering, University of Phayao
การออกแบบระบบไฟฟ้าและสื่อสาร หมวดที่ 2 อาคารชุด โรงแรมและคอนโดมิเนียม รุ่นที่ 2
Teamsอา. 25 ต.ค. 2569 · 09:00–17:00
เรียนรู้หลักการออกแบบและติดตั้งระบบไฟฟ้าในอาคาร เข้าใจการเลือกใช้อุปกรณ์และการตรวจสอบความปลอดภัย ประยุกต์ใช้ความรู้กับงานวิศวกรรมและงานติดตั้งจริง
14 PDULimited to 40 seats
1,590 ฿VAT included
RegisterProducts & Software
Products and software
ezyRTS & MultiRm
Cooling load calculation
Cooling load by the RTS method from the 2021 ASHRAE Handbook, for any city worldwide, with multi-room calculation and automatic psychrometric charts (SI and I-P).
ezyDuct & Duct Sizer
Duct design and pressure loss
Software and mobile apps for duct design and pressure loss, in SI and I-P units, showing equivalent round and rectangular duct sizes.
ezyPipeCal & Pipe Sizer
Pipe flow friction loss
Pressure loss and pump sizing for water piping — steel, PVC, HDPE and PPR — with an adjustable C value and companion mobile apps.
Books
HVAC engineering books
HVAC engineering books and manuals based on ASHRAE standards, ordered directly through our own website.
Free online calculation tools
Calculation tools we built, free for engineers and students to use with no sign-up required.
Cooling load
Room cooling load by the ASHRAE method, to size equipment correctly
Open toolEnergy use (Thailand)
Estimate air-conditioner energy cost by Thai province and operating hours
Open toolEnergy comparison
Compare running cost and value between air-conditioner models
Open toolEnergy use (other countries)
Energy use with weather data for cities anywhere in the world
Open toolezyPipeCal
Pipe friction loss and pump sizing for steel, PVC, HDPE and PPR
Open toolDuct estimate
Estimate duct sizes and lengths from a drawing image
Open toolezyPsychro
ASHRAE psychrometric chart — plot air states and draw coil, mixing and other processes
Open tool
News
News and activities
No news at the moment.
Ready to start your project?
Free consultation, no cost.