Air conditioning is one of the most important systems in any commercial premises and, paradoxically, one of the most neglected when it comes to maintenance. The usual logic is simple: as long as it works, do not touch it. The problem is that when it stops working — typically at the worst possible moment, in the middle of July or August — the cost of an emergency repair can be several times that of an annual preventive maintenance programme, without counting the losses from closure or the inconvenience to customers and staff.
This practical guide explains what a proper maintenance plan for commercial premises HVAC should include, how often the various tasks need to be carried out, what the legal obligations are and how to spot the signs that something is wrong before it becomes a major breakdown.
Why preventive maintenance is profitable
An HVAC system without maintenance can consume up to 30% more energy than one in good condition. Dirty filters, a fouled coil, insufficient refrigerant or a poorly calibrated control system force the compressor to work harder and longer to achieve the same thermal result.
In addition, components operating under greater stress have a shorter service life. A preventive check that detects a refrigerant leak or a dirty condenser in time can prevent premature compressor failure, whose replacement cost can exceed EUR 1,500-3,000 for medium-capacity equipment, not counting labour or downtime without climate control.
The ratio between the annual cost of preventive maintenance (typically EUR 150-400 per unit, depending on capacity and type) and the cost of the breakdowns avoided is systematically in favour of maintenance.
Legal obligations: the RITE
The RITE (Reglamento de Instalaciones Termicas en los Edificios — Spain’s Building Thermal Installations Regulation) mandates periodic inspections and maintenance of HVAC systems. Frequencies and requirements vary according to installation capacity:
- Installations with rated capacity above 12 kW: require a maintenance plan with documented records and, in many cases, a maintenance contract with an accredited company.
- Installations with capacity above 70 kW: require a designated maintenance director and periodic submission of an energy efficiency report.
- Periodic technical inspections: HVAC equipment with cooling capacity above 12 kW or heating capacity above 70 kW is subject to technical inspection every 5 years by an Authorised Inspection Body (OCA).
Breaching these obligations can lead to financial penalties and, in the event of an accident or incident, problems with the premises’ insurance. An accredited maintenance company takes care of keeping all documentation up to date.
The installation register: the building log
Thermal installations must have a maintenance logbook recording all actions taken: periodic inspections, repairs, component changes and refrigerant checks. This register can be demanded during administrative inspections and serves as documentary evidence in any incident.
Maintenance plan by frequency
Monthly maintenance (or every 2-3 months depending on use)
- Visual inspection and cleaning or replacement of filters as needed. In premises with heavy foot traffic, filters become dirty faster than expected.
- Condensate drain check: The drain for water produced by the indoor unit must be clear. A blocked drain causes water overflow onto the ceiling or floor and can damage the structure or merchandise.
- Verification of temperature setpoints and thermostat operation.
Six-monthly maintenance
- Evaporator cleaning (indoor unit): The evaporator coil accumulates dust, allergens and, in humid environments, mould and bacteria. Cleaning with appropriate products restores heat transfer and improves indoor air quality.
- Condenser cleaning (outdoor unit): The outdoor condenser accumulates dust, leaves and dirt. A dirty condenser raises condensing temperature, reduces efficiency and can push high pressure to levels that trigger safety devices.
- Electrical connection inspection: Terminal tightening checks, current draw measurement and verification of protection condition.
- Refrigerant circuit pressure verification: A pressure drop from nominal values may indicate a refrigerant leak. Fluorinated gas leaks must be detected, repaired and recorded by a company with a certified refrigeration installer.
Annual maintenance
- Full system analysis: Review of all operating parameters, refrigerant top-up if necessary, verification of all safety elements.
- Deep cleaning of indoor and outdoor units.
- Inspection of the electrical panel associated with the HVAC installation.
- Vibration and abnormal noise checks: Unusual vibrations often precede mechanical failures.
- Maintenance logbook update and installation certificate review.
- Performance test: Measurement of the equipment’s actual COP to detect efficiency degradation before it becomes serious.
Warning signs you should not ignore
There are symptoms indicating the system needs immediate attention, before the next scheduled inspection:
- The unit does not reach the target temperature despite running for hours: possible refrigerant leak or very dirty filters.
- Unusual noises (cracking, knocking, hissing): may indicate deteriorated mechanical components, excessive vibration or fan problems.
- Musty or burning smell: The former may indicate mould in the evaporator; the latter, electrical problems.
- Water dripping from the indoor unit: Blocked drain. If not resolved quickly, it can damage ceilings or merchandise.
- Sudden increase in electricity consumption with no change in use: the system is working harder than necessary to achieve the same result.
- The unit starts and stops in very short cycles (short cycling): indicates a sizing problem, refrigerant issue or sensor fault.
The cost of not doing maintenance
To illustrate the difference between preventive and reactive maintenance, consider two scenarios for a commercial premises with 3 split units rated at 5 kW:
Scenario A: annual preventive maintenance
- Maintenance contract cost: EUR 350/year
- Energy saving versus unmaintained equipment (30%): approximately EUR 400/year
- Equipment service life with maintenance: 12-15 years
- Cost of major breakdowns over 10 years: virtually nil
Scenario B: no maintenance
- Extra energy cost due to efficiency loss: approximately EUR 400/year
- Medium repair (valve, sensor, refrigerant leak): EUR 300-600
- Compressor replacement in year 7 due to accelerated wear: EUR 2,500
- Early equipment replacement in year 8: full cost of new units
The illusory saving from not paying for maintenance becomes a far greater expense in the medium term.
How to choose a maintenance company
Not all HVAC companies are accredited to carry out maintenance under the RITE. Before hiring, verify:
- Accreditation as an HVAC installation company (installer certificate for heating, HVAC and DHW).
- Certified refrigeration installer for handling fluorinated gases (F-Gas).
- Experience with your type of installation (splits, VRF, ceiling-mounted units, etc.).
- Documentation and records: A professional company always delivers a written report after every visit and keeps the maintenance logbook up to date.
At Acoval we offer preventive HVAC maintenance contracts for commercial premises in Valencia and the surrounding area. Our team holds all the necessary certifications and takes care of keeping your installation in optimal condition, with all the documentation required by the RITE.
If you want to know what our maintenance contract includes or would like a quotation, get in touch through our contact page.
