Do you know why you need to schedule your AC maintenance and repair services now? Because it’s difficult to book an emergency repair (or even a regular one) during the peak summer months. You don’t believe us? Here’s proof.
The keyword “AC repair” jumped 266% in search volume during the peak of summer last year, according to The News Tribune, implying that the seasonal demand for HVAC repair service heightens between June and July. If you have been planning that much-needed AC preventive care, today is the right time to book your service, before summer vacation hype distracts you – and before HVAC technician schedules fill up.
In humid Seattle, you can’t let your HVAC system let you down this summer. Read this guide to find out the most common HVAC problems you might encounter, and whether you need to have your professional service provider prioritize them.
6 AC System Problems You Must Not Bring into Summer
When an AC unit runs continuously for hours or days, the compressor endures sustained thermal stress. The refrigerant pressure also fluctuates past the normal range, and coils accumulate grime faster. In the Pacific Northwest, air conditioners run frequently for most of the year. This is because both damp winters and humid summers require the system for heating and cooling.
A system with such rigorous activity needs regular servicing to remain on top of its function. When you miss a spring tune-up, your AC unit will be entering summer compromised. Below are the top 6 problems our HVAC service company in Seattle is often called to fix:
Weak Airflow
Weak airflow is evident when you notice uneven cooling across rooms or low air pressure from vents. Certain areas of the home do not reach the set temperature either.
Causes: Most of the time, a clogged air filter is the primary cause of weak airflow. Many homeowners may miss cleaning filters during spring cleaning. Beyond that, blocked or leaking ductwork and a deteriorating blower motor are other possibilities. Each of these restricts the volume of conditioned air that actually reaches your living space.
What to do: Begin with the filter. If it hasn’t been replaced in the past 30 to 60 days, change it and run the air conditioner again. If it doesn’t work, check that furniture, rugs, or stored items aren’t blocking the supply or return vents. If airflow remains inadequate after those steps, the issue likely lies in the ductwork or the blower motor, both of which require a professional ventilation check.
HVAC Blowing Warm Air
When the thermostat is set correctly, and the system appears to be running normally, but warm air or only slightly cooler air is coming out of the vents, there is a problem.
Causes: The most common cause of warm air from HVACs is a refrigerant leak. As refrigerant levels drop, the system loses its ability to transfer heat effectively. Dirty condenser coils and a malfunctioning thermostat produce similar symptoms.
What to do: Check if your thermostat is set to “cool” mode, not “fan only”. This is a surprisingly common oversight. Next, inspect the outdoor condenser unit and clear away any dirt, leaves, or debris that are restricting airflow around the coils. If neither step resolves the issue, contact a licensed HVAC technician. Refrigerant check and recharging are regulated procedures that require proper certification and should not be attempted as DIY.
Frozen Evaporator Coils
Visible ice formation on the indoor air handler, accompanied by a steady decline in cooling performance throughout the home, is the telltale sign of frozen coils.
Causes: The evaporator coil absorbs heat from indoor air as refrigerant passes through it. When airflow across the coil is restricted, due to a dirty filter, blocked vents, a failing blower, or low refrigerant levels, the coil temperature drops below freezing. Ice begins to form and eventually blocks airflow.
What to do: Shut the system off completely and allow the coils to thaw. This typically takes four to eight hours. Do not attempt to chip or scrape the ice as it can damage the coils. Replace your air filter once thawing is complete. If the coils freeze again after restarting, the unit’s refrigerant level is likely low, requiring professional HVAC repair service.
Water Leaks Around the Unit
The AC unit could be leaking water, or moisture is pooling near the indoor air handler or along the condensate drain line.
Causes: As your HVAC runs, it removes humidity from the air. That moisture collects and drains away through the condensate line. When that line becomes clogged with algae, debris, or sediment, water backs up and overflows, which causes the leak.
What to do: The best solution is a professional HVAC repair service. This issue deserves prompt attention as prolonged moisture exposure creates conditions for mold growth. It can also cause significant water damage to walls, ceilings, and flooring.
Short Cycling
If the system turns on, runs for a short period, then shuts off before completing a full cooling cycle, your HVAC may be experiencing short cycling. This prevents the unit from providing enough cool air to reach a comfortable indoor temperature.
Causes: Short cycling is often caused by an oversized unit. Industry sizing standards exist for a reason: a unit with too much capacity for the space cools the air near the thermostat too quickly. This triggers a shutoff before the rest of the home is adequately cooled, and restarts shortly after. Poor thermostat placement, such as near heat-generating appliances, in direct sunlight, or adjacent to supply vents, produces the same behavior. Electrical faults are a less common but more serious cause.
What to do: Have a technician evaluate thermostat placement and recalibrate if necessary. If the unit has always cycled this way, a load calculation may reveal that the system was improperly sized at installation. A professional electrician should diagnose electrical issues.
Unusual Noises
You may notice sounds coming from your HVAC unit that weren’t present before. This may be banging, grinding, squealing, rattling, or persistent clicking during operation or startup.
Causes: Each sound points to a specific failure. Banging typically signals a loose or broken component inside the unit. Grinding suggests that motor bearings are starting to wear out. Squealing is commonly associated with a deteriorating belt or a motor in need of lubrication. Persistent clicking that continues beyond startup often indicates a failing relay or electrical control issue.
What to do: If a loud or sudden sound begins, shut off the system immediately. This kind of HVAC problem requires troubleshooting by qualified technicians.
When to Call a Professional
Filter replacements, clearing debris from around the outdoor unit, and basic thermostat adjustments are simple enough for a homeowner to handle. Everything beyond that, such as refrigerant issues, electrical faults, recurring coil freezing, water leaks, and unusual sounds, falls within the scope of professional HVAC service.
Refrigerant handling is regulated under federal environmental law and requires certified technicians. Electrical diagnostic work on HVAC systems carries real risk for untrained individuals. Certified professionals bring calibrated diagnostic equipment, manufacturer training, and the experience to identify root causes rather than surface symptoms.
Preventive Maintenance: The Most Cost-Effective Investment
The most expensive AC repair is the one that could have been prevented. Consistent maintenance keeps your system operating at rated efficiency and dramatically reduces the likelihood of mid-season failures:
- Replace filters every 30 to 60 days during periods of heavy use.
- Keep the outdoor condenser clear of leaves, grass clippings, and debris year-round.
- Schedule a pre-season tune-up before summer demand peaks.
- Book a bi-annual professional inspection to assess refrigerant levels, electrical integrity, coil condition, and overall system health.
These practices align directly with HVAC industry maintenance guidelines and extend equipment lifespan.
Act Early Before a Small Problem Becomes a Costly One!
Most summer HVAC failures don’t arrive without warning. Weak airflow, inconsistent cooling, unfamiliar sounds, and rising energy costs are all signals worth taking seriously. Addressing them early is almost always a fraction of the cost of emergency repair or full system replacement.
If your system is showing any of the signs outlined above, don’t wait for a complete breakdown. Schedule a professional HVAC inspection with Energy Technologies now, and welcome the summer season with confidence that your system is ready for whatever the heat brings.
