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You can use a pressure washer to clean the outdoor condenser coils if the dirt buildup is too heavy for a garden hose and sprayer. Use a gentle setting on your pressure washer to avoid damage to the coils and fins. Do not use a pressure washer on indoor evaporator coils.

NATE (North American Technician Excellence) certification is not legally required for HVAC technicians in most areas, but hiring a professional with this certification is highly recommended. NATE-certified technicians demonstrated their expertise and proficiency in different types of HVAC systems, offering assurance of quality service. It's a voluntary certification, yet it indicates a commitment to professionalism and ongoing training. Choosing a NATE-certified technician often means you're working with someone who is up-to-date on industry standards and best practices, which can lead to better service, energy efficiency, and long-term cost savings.

Most HVAC service calls include diagnostic fees, which could include checking on a specific issue you’re experiencing or running through a routine inspection checklist. If you called for a particular problem, the service call will also include an estimate to fix the issue, including materials and labor. Depending on your HVAC technician and the service you requested, you might also get a general inspection of your system components to ensure everything is working as intended.

While caulking is handy for quite a bit of jobs, it’s still limited. Any crack or gap larger than 1/4 inch is best left for a more intensive repair job. When you hire house painters, they should run a thorough check to see what they need to repair before they start the job.

Large repairs that caulking typically won’t do well with include cracks or holes larger than a 1/4 inch, rotted wood, or metal surfaces, such as garage doors.