In collaboration with Climatiza. Radar Panamá works with this company, and the analysis follows the same editorial standards. How we work
Contents of this guide
Why an air conditioner leaks
An air conditioner often leaks because the water the coil condenses finds no way out. The guides reviewed point to a clogged drain, a condensate pan that does not drain and condensation from high humidity. The cause is narrowed down by where the water falls.
The US Department of Energy recommends checking that the drain is not clogged and occasionally running a stiff wire through its channels (Home Cooling 101). ENERGY STAR notes that a plugged drain can cause water damage (maintenance checklist), and the EPA asks for drip pans that are clean, flowing and unobstructed (chapter 2).
| Sign | Cause it points to | Source |
|---|---|---|
| Water falls from the indoor unit or false ceiling | Clogged drain or a pan that does not drain | Department of Energy and EPA |
| It leaks and also cools poorly | Clogged filter restricting airflow, or low or leaking refrigerant | Department of Energy |
| Drops on pipes, ducts or diffusers | Condensation from high humidity | EPA, brief guide |
Why an air conditioner smells
A damp or “dirty sock” smell usually points to standing water or microbial growth in the pan, the coil or the filters. The EPA treats moldy odors as a sign of moisture. A burning smell is different: it is treated as an electrical fault and calls for switching the unit off.
| Smell | Possible origin | What is advisable | Source |
|---|---|---|---|
| Damp, moldy or “dirty sock”, especially at start-up | Standing water or microbial growth in the pan, coil or duct | Check filters and the visible drain; if it persists, a technician | EPA, chapter 3 and Climatiza |
| Burning or rubber | Possible electrical fault | Switch the unit off and call an electrician or technician | NFPA |
A 1992 study found, in a well-maintained system that looked clean, between 100,000 and one million bacteria per square centimeter on the coil fins (Hugenholtz and Fuerst). It was a single system: an example, not a general figure. The guide on the office that smells damp covers more cases.
Panama’s humidity and the risks to ceilings and equipment
In Panama, humidity keeps condensate constant, and a drain failure shows up quickly. The Tocumen station records an average annual relative humidity of 75.7%. The EPA recommends keeping buildings below 60%, ideally between 30 and 50%, to prevent mold in occupied spaces.
The ETESA figure covers 1977 to 2010 and is one station’s average, not a building measurement (Panama Climate Center). The effect of sea air is covered in the guide on salt air. The EPA lists poorly draining pans among places of hidden mold, says not to run a system known or suspected to have mold (chapter 3), and asks that wet areas be dried within 48 hours (chapter 2).
What staff can check and what needs a technician
Staff can check the filter, confirm by sight that the drain is not clogged, and switch the unit off if water falls on electrical installations. Refrigerant, the coil, the internal pan and electrical faults belong to a technician. ENERGY STAR recommends checking the filter once a month.
- Switch the unit off if water falls near panels or outlets.
- Check the filter: it is inspected, cleaned or changed once a month, per ENERGY STAR.
- Look at the visible drain and confirm it is not blocked.
- Note where the water falls, when the smell appears and whether the unit cools.
- Call the technician if the leak or smell continues or a refrigerant leak is suspected, which the Department of Energy leaves to trained personnel.
Preventive and corrective maintenance
Preventive maintenance checks and cleans the unit before it fails; corrective maintenance repairs a failure that has already happened. For leaks and smells, preventive work covers filters, pans and drains. ENERGY STAR recommends yearly contractor visits and the Department of Energy, a yearly coil check.
According to its website, Climatiza Panamá offers maintenance contracts with scheduled preventive visits and a written report, which review filters, drains, condensate pans and drain lines. For stopped equipment, it offers diagnosis and repair through its contact page. Duct cleaning applies when there is mold in the system. The guide on the maintenance contract details what it should include.
Myths and facts
- Myth: a small leak does not matter. Fact: ENERGY STAR warns of water damage, and the EPA asks that wet areas be dried within 48 hours.
- Myth: if the unit looks clean, there are no microbes. Fact: the system in the 1992 study looked clean and still had bacteria on the coil.
- Myth: a disinfectant solves mold in lined ducts. Fact: the EPA has no biocides approved for lined ductwork, and controlling moisture is the most effective step.
Climatiza Panamá offers maintenance contracts with preventive visits and diagnosis of stopped equipment; duct cleaning applies when there is mold in the system.
Frequently asked questions
Why does an air conditioner leak?
It leaks because the water the coil condenses does not leave through the drain: the usual causes are a clogged drain or a pan that does not drain. It can also come from a clogged filter or condensation in high humidity.
Why does an air conditioner smell bad?
A damp smell often means standing water or microbial growth in the pan, coil or filters. A burning smell calls for switching the unit off and calling an electrician or technician, according to the NFPA.
Is air conditioner mold dangerous?
Mold in an HVAC system should be investigated and resolved promptly, and the EPA says not to run the system if contamination is suspected. The prudent course is to switch off, dry and ask for a technical check.
What can be checked before calling a technician?
The filter can be checked, the drain confirmed clear by sight, and the unit switched off if water falls near electrical installations. Refrigerant and burning smells are left to the technician.
How often should the drain and filters be cleaned?
Filters are checked once a month, per ENERGY STAR. For the drain, the Department of Energy recommends running a stiff wire through now and then; the sources set no exact interval.
Related articles
- Air conditioning and maintenance in Panama
- Air conditioning by the sea in Panama: salt air
- Air duct cleaning in Panama
- Office air conditioning not cooling: what to check
- Why does the office smell damp?
- Maintenance contract for businesses
From the Climatiza Panamá blog (in Spanish): air conditioner leaking water from the false ceiling and air conditioner smelling of damp or mold.
Sources
- EPA, Mold Remediation in Schools and Commercial Buildings, chapter 2.
- EPA, Mold Remediation in Schools and Commercial Buildings, chapter 3.
- EPA, A Brief Guide to Mold, Moisture and Your Home.
- US Department of Energy, Home Cooling 101.
- ENERGY STAR, Maintenance Checklist.
- NFPA, Electrical Safety Tips.
- Hugenholtz and Fuerst, Applied and Environmental Microbiology, 1992.
- ETESA, Panama Climate Center, Tocumen station, 1977 to 2010 (in Spanish).
Ask about this article
Type your question and we will show you the answer inside this article or in other Radar Panamá publications.
