ACH Calculator is a digital HVAC calculator for mobile devices with the Android operating system and is designed as an aid for calculating thermal load of a room or other living space and therefore determining the adequate air conditioner cooling capacity for your home. ACH stands for Air Conditioner Home. The results of needed cooling power and investment and operating costs of air-conditioning systems that are obtained using ACH calculator are only approximate (orientational) values, and depending on the specific situation plan of your rooms the results should not deviate more than 30% from the accurate values. The heat load of the home space is affected by a very large number of factors and their mutual relations, so ACH calculator is trying to unify only the most important factors in order not to confuse the users and still obtain a pretty accurate result for air conditioner cooling power. The best results, ACH calculator will display for smaller homes with areas up to 2000 sqft (185m2), for bigger homes possible error in the results increases with increasing area value of your home. In any case, for obtaining precise data it is necessary to hire a licensed HVAC engineer and make HVAC project.

Air conditioner buying, installing and operating costs are given in relation to the average prices of installation and maintenance of air conditioners in the world and the US, therefore cost results represent a rough but relatively good financial estimate of the cost for most spaces. Keep in mind that the price of the air conditioners and the price of the HVAC technician working hours can be significantly different from country to country and may even vary between cities in the same country.

ACH Calculator is intended mostly for homeowners and HVAC equipment salespeople and HVAC technicians, students, and rookie HVAC engineers, although it can also be used by the experienced HVAC engineers to verify and confirm their experiential knowledge of space thermal load. Using ACH calculator can be a quick and easy way for owners of apartments and houses to get a good assessment of the required air conditioner cooling power and also to get a solid picture of financial costs related to the air conditioner installation and maintenance. Also HVAC dealers, at the request of customers, can quickly and easily make a recommendation for the choice of air conditioner based on calculated cooling power and also give other useful information and guidance regarding the air conditioning costs. Using the ACH calculator, HVAC sellers will make a professional impression on their customers, thus building a reputation for themselves and promote sales. Of course, you should always inform your clients that the precise HVAC results can only be calculated through project development made by a professional and licensed HVAC engineers, especially in the case of larger surface areas (more than 200m2) or special purpose areas (laboratories, hospitals, workshops ...).

ACH Calculator was made by Nathan Gale, a graduate mechanical engineer and HVAC designer and maintenance manager with 15 years of experience in the HVAC field. The author will be grateful to every well-intentioned user who points him to any errors or omissions in the ACH calculator and expresses special gratitude to anyone who suggests the way in which this calculator can be improved to be more valuable and useful in its next version.