The 6 mistakes to avoid before buying an air conditioner in 2025
Are you considering purchasing an air conditioner for your home or office? Before you make a purchase, take a moment to familiarize yourself with the most common mistakes that can turn your investment into an energy (and financial) nightmare.
Here is our comprehensive guide to choosing your air conditioner with confidence.
1. Underestimating the power required
This is the most common mistake: choosing an air conditioner that is too weak or too powerful for the room. This results in:
excessive power consumption,
premature wear,
insufficient thermal comfort.
Tip:
Use a power calculator (BTU/kW) or request a professional thermal diagnosis to correctly size your equipment.
2. Base your decision solely on price
A low price may conceal:
low energy efficiency,
a high noise level,
questionable reliability.
Tip
Check the energy rating (A++ or A+++), the brand, customer reviews, and the manufacturer’s warranty. A good air conditioner is a long-term investment.
3. Neglecting installation
Tip
Have the installation carried out by an RGE-certified professional and take advantage of the financial assistance available.
4. Don't anticipate the interview
Believing that an air conditioner works without maintenance.
A poorly maintained device can:
become less effective,
consume more,
accumulate bacteria or mold in the filters.
Council
Choose a model with easy access to the filters.
Choose a brand with good customer service.
Schedule an annual service (often mandatory for fixed models).
5. Niet controleren welke subsidies of toelagen er in België beschikbaar zijn
In Belgium, there are various regional subsidies available to encourage the installation of energy-efficient systems, including certain reversible air conditioners (air-to-air heat pumps).
Failing to find out about these subsidies could potentially cost you several hundred euros.
To do:
Check the conditions for receiving subsidies in your area:
Brussels-Capital Region: Energy subsidies (particularly for air-to-air heat pumps, subject to conditions).
Wallonia: Housing subsidies (with mandatory preliminary audit).
Flanders: Lower direct subsidies for air-to-air heat pumps, but certain conditions allow for a reduced VAT rate of 6%.
Installation must generally be carried out by a licensed or certified professional (e.g., RESCert).
Always keep detailed invoices and proof of energy performance.
6. Do not take into account the heating function (reversible air conditioner).
In Belgium, air conditioners are often seen as devices used only in summer. However, reversible models (also known as air-to-air heat pumps) can also be used for heating between seasons—or even year-round if properly sized.
By neglecting this function, you are missing out on a 2-in-1 solution: cooling in summer and economical heating in winter.
To do:
Verwarmt u misschien al met gas of stookolie? Een warmtepomp kan uw factuur in het tussenseizoen (lente/herfst) verlagen.
Check carefully that the model is designed to operate in heating mode at low outside temperatures (down to -15°C).
- In the Brussels, Flemish, or Walloon regions, these systems can cover a large part of heating needs during the fall and spring.
Need help with an installation of air conditioning in Belgium?
If you are considering installing a fixed or reversible air conditioning system in Brussels, Waterloo, Wavre, Rixensart, Overijse, Grimbergen, Meise, Wemmel, Braine-l’Alleud or in the surrounding area, it is essential to call on an experienced installer.
👉 For reliable service, personalized advice, and installation that complies with current standards, we recommend visiting the website of Frigotech—a specialist in air conditioning, ventilation, and heat pumps in the region.
The team responds quickly and helps you choose the right device for your home, your needs, and your budget.
Conclusion
Buying an air conditioner in 2025 isn’t just a question of budget. It’s an investment in comfort, but also in sustainability. By avoiding these six mistakes, you can ensure a cool summer without any unpleasant surprises on your bills or in your sleep.
💬 And you, have you ever regretted a purchase of an air conditioner?
Share your experience in the comments 👇
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