Common Problems
Why is one room hotter/colder than others?
Uneven temperatures between rooms are usually caused by airflow problems, poor insulation, or incorrect system balancing. Common culprits include blocked or closed vents, undersized or leaky ductwork, and rooms that receive more sun or have more windows than others.
In many cases, the system needs professional balancing, where airflow is adjusted so each room gets the right volume of conditioned air. Adding or repairing insulation, sealing duct leaks, and checking that furniture or curtains are not blocking vents can also significantly improve comfort.
Why is my AC blowing hot air?
If your AC is blowing warm air instead of cooling, the problem is often a dirty air filter, incorrect thermostat settings, or a blocked outdoor unit. A clogged filter restricts airflow and can cause the system to overheat, while debris around the outdoor unit prevents proper heat release.
More serious causes include low refrigerant levels, refrigerant leaks, or compressor and electrical issues that require a qualified technician. If the thermostat is set correctly and the filter is clean, and the system still blows hot air, it is best to turn it off and schedule a service visit to avoid further damage.
What causes strange noises from my system?
Unusual sounds such as banging, rattling, squealing, or grinding usually indicate mechanical or airflow issues inside the HVAC system. Loose panels or components can cause rattling, while worn belts or motor bearings often create squealing or grinding noises.
Whistling or whooshing sounds may signal airflow restrictions due to a dirty filter, closed vents, or ductwork issues. Any new, loud, or persistent noise should be checked by a professional as soon as possible, because continuing to run the system can lead to more extensive and costly damage.
How do I prevent mold in my air conditioner?
Mold growth in air conditioners is typically linked to excess moisture, poor drainage, and lack of regular cleaning. To prevent this, it is important to keep filters clean, ensure the condensate drain and drip pan are clear and flowing properly, and maintain adequate airflow through the system.
Using the system’s “auto” fan setting instead of “on” can help reduce moisture left on coils, and maintaining indoor humidity in the recommended range (typically around 40–60%) reduces the conditions mold needs to thrive. Regular professional maintenance that includes coil cleaning and inspection of the drain system is one of the most effective ways to keep mold from developing in your AC.
Service & Maintenance
How often should I service my HVAC system?
HVAC systems should be serviced twice a year - once in the spring before cooling season and once in the fall before heating season. This bi-annual maintenance schedule ensures both your air conditioning and heating components are in optimal condition before peak usage periods, preventing unexpected breakdowns during extreme weather.
For older systems (over 10 years), those in high-use environments, or homes with pets and allergies, more frequent servicing may be beneficial. Regular professional maintenance extends system lifespan, improves energy efficiency, and can reduce utility bills significantly.
How often should I change my air filters?
Air filter replacement frequency depends on filter type and household conditions. Standard 1-inch filters should be replaced every 1-3 months, while thicker filters last longer - 4-inch filters every 6-9 months and 5-inch filters every 9-12 months.
Homes with pets should replace filters every 2 months, while typical suburban homes without pets can replace every 3 months. During peak heating or cooling seasons, filters collect more debris and may need monthly replacement. Check your filter monthly to assess its condition, and write the installation date on each new filter for easy tracking.
What's included in regular maintenance?
A comprehensive HVAC maintenance visit includes inspecting and changing air filters, lubricating moving parts, testing and adjusting refrigerant levels, inspecting and cleaning condenser and evaporator coils, and checking all electrical connections.
Technicians also clean and adjust blower components, examine belts for wear, test thermostat sensors and controls, inspect the condensate drain line and pan, and verify proper system operation through complete cycling tests. The inspection covers both indoor and outdoor units, ensures correct voltage to all components, checks for refrigerant leaks, and tests discharge and suction pressure to optimize system performance.
Do you offer emergency or after-hours service?
Yes, we provide 24/7 emergency repair services available every day of the year, including weekends and holidays. Our fully-stocked service trucks and experienced technicians are ready to respond quickly and can diagnose and repair most issues on the first visit.
We offer emergency services for urgent situations such as complete system failure during extreme temperatures, refrigerant leaks, electrical issues, or any problem affecting your health and safety. For non-emergency issues, we can also schedule same-day or next-day appointments during regular business hours to address your concerns promptly.
Heat Recovery
What is heat recovery, and how does it work?
Heat recovery is a process in which heat from exhaust air is used to warm fresh air being supplied into a building. This saves energy, improves air quality, and reduces heating costs.
What are the main advantages of heat recovery?
The main benefits of heat recovery systems include significant energy savings, with systems capable of recovering 30-90% of heat from exhaust air, reducing heating costs by up to 30-50%. This makes them particularly valuable for low-energy and passive houses.
Air quality improvements are another key advantage, as heat recovery units continuously replace stale air containing CO₂, moisture, and pollutants with fresh, filtered air. The filtration removes dust, pollen, and contaminants, making these systems especially beneficial for people with allergies and respiratory issues.
Additional benefits include moisture control and mold prevention through continuous humidity regulation, acoustic comfort since windows can remain closed, and environmental protection through reduced greenhouse gas emissions. Modern systems can also incorporate ionization and air purification features to remove viruses and bacteria.
Is heat recovery suitable for smaller spaces?
Yes, heat recovery is suitable even for smaller spaces. Decentralized (local) systems are specifically designed for apartments, offices, or individual rooms and can be easily installed in a wall opening without the need for complex ductwork. These units offer high efficiency (often up to 80–90%), help maintain indoor air quality, and are ideal for renovations or buildings where installing a central system is not practical.
Can heat recovery be combined with a heat pump?
Yes, heat recovery systems work exceptionally well with heat pumps, and their combination creates a highly efficient heating and ventilation solution. The pairing can reduce heating and ventilation costs by 50-80% compared to electric or gas heating.
Heat recovery prevents the expensive heat produced by the heat pump from escaping during ventilation by capturing warmth from exhaust air and transferring it to incoming fresh air. This reduces the energy demand on the heat pump and increases its already high efficiency. The systems can operate independently with separate controls or be integrated with shared regulation.
For new construction or major renovations, all-in-one units are available that combine both technologies in a compact device. These integrated systems use outdoor air both for ventilation and as an energy source for the heat pump, and can also handle domestic hot water heating. The synergy is particularly effective when paired with low-temperature heating systems like underfloor heating, which matches the optimal operating conditions for heat pumps.
How demanding is the installation of heat recovery?
The installation complexity varies significantly between system types. Central heat recovery systems require detailed planning during the design phase, including space for ductwork in ceilings or floors, and are best installed during new construction or major renovations. These systems need professional installation with air distribution channels throughout the building and typically require several days to complete.
Decentralized (local) units offer a much simpler installation process, requiring only a wall opening (typically 160-225mm diameter) and can be installed in just a few hours without extensive renovations. These units are ideal for existing buildings and apartments where installing ductwork isn't practical. The installation involves drilling through the exterior wall, mounting the unit, and connecting it to electricity - no complex ventilation ducts are needed.
For central systems in family homes, proper planning is essential to ensure adequate space for the unit itself (usually placed in a utility room, basement, or attic) and for routing distribution channels to all rooms. Professional design and installation are recommended to achieve optimal performance and efficiency.
