Furnace Repair Sunnyvale

Find the best Furnace Repair in Sunnyvale

Receive multiple Furnace Service quotes for your project today! Compare profiles, reviews, accreditations, portfolio, etc... and choose the best service.

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  • Nur HVAC
    4.9
    1078 Wentworth St, Mountain View, 94043, US

    Nur HVAC is a professional HVAC company providing fast, honest, and friendly service that exceeds your expectations. Our mission is to provide exceptional service and ensure customer satisfaction. We stand behind our work with a 100% money-back guarantee. If you're not fully satisfied, we will refund your money, apply a discount on the next service! Our team of certified professionals is committed to excellence, and our track record of positive reviews reflects our dedication to quality service.

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  • MYC Appliance Repair
    4.8
    442 Cirrus Ave, Sunnyvale, 94087, US

    MYC Appliance is an appliance repair company with years of experience in the field. Our team of professional technicians is dedicated to providing high-quality, reliable appliance repair services to customers in the US. We understand the importance of having your appliances working properly, and we strive to provide fast, efficient, and affordable solutions to all your appliance repair needs. Our mission is to offer our customers the best possible service by providing same-day or scheduled appointments, performing thorough diagnostics, and using quality parts. We stand behind our work with a 3-month warranty on parts and labor. At MYC Appliance, we believe in transparency and customer satisfaction. We offer free diagnostics with any repair service, and our initial service fee includes the trip charge and diagnostics. We also provide discounts for first-time and senior customers. Contact us today to schedule an appointment and experience the MYC Appliance difference.

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  • Finest Heating & Air
    4.9
    Sunnyvale, US

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  • Same Day Air Conditioning & Heating
    4.7
    Sunnyvale, US

    Same Day Air Conditioning and Heating is a Santa Clara HVAC company that provides same-day service for air conditioning and heating repair, installation, and maintenance. Our licensed technicians specialize in the installation, maintenance, and repair of heating and cooling systems, servicing all makes and models, offering free in-home estimates, and 24-hour emergency service. We serve the San Francisco South Bay area, including Menlo Park, Santa Clara, Los Gatos, Los Altos, San Jose, Sunnyvale, and surrounding cities. Our goal is to provide affordable and reliable HVAC service to our customers, and we strive to have your home comfortable and cozy. We specialize in the service and repair of most residential and light commercial heating and air conditioning applications, as well as air quality control, duct cleaning, sealing, and replacement. We are experts at repairing and servicing your equipment and aim to have it up and running as soon as possible.

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  • Sunny HVAC and Appliance Repair
    4.3
    Sunnyvale, US

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  • DunRite Heating & Air Inc.
    3.8
    Sunnyvale, US

    We are available to answer your calls everyday from 8:30 AM to 8:00 PM. As the owner of DunRite Heating & Air, Inc., my business model has evolved over the last couple of years. I believe that with the ever-changing, uncertain times that we all live in that the “business as usual” philosophy that is still held by most of my competitors is a fatal mistake. The days of high-pressure sales tactics and always trying to upsell is a 2004 way of doing business. Today is a new economic time in our country, and in order to succeed in business, a business must recognize and adapt accordingly. With that said, I am taking a personal involvement in all aspects of the company’s daily operations. You have my commitment that our appointment times will be kept, and all of our employees will be polite, courteous, and respectful of your home and property. We will always provide up-front pricing and honor the price that is given—no up-selling midway through the job. In conclusion, if DunRite Heating & Air, Inc. is fortunate enough to do whatever work you may need, you will have my personal guarantee that you, your family, and your home will be treated with absolute professionalism.

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Frequently Asked Questions about Furnace Repair

Is your furnace acting up? Get answers to common questions about furnace repair and find trusted local technicians.

How can I tell if my furnace is the correct size for my home?

A correctly sized furnace is crucial for efficient and comfortable heating. An too-small furnace won't adequately heat the space. An oversized furnace will short cycle, causing wear and tear, inconsistent heating, and inflated utility bills. Signs that your furnace may not be correctly sized include::
  • High Energy Bills: An incorrectly sized furnace can lead to increased energy consumption.
  • Inconsistent Temperatures: Noticeable temperature fluctuations between rooms.
  • Short Cycling: If your furnace cycles frequently, it could be an indication and wasting energy.
  • Poor Air Quality: If the airflow from the vents seems weak or there are areas with inconsistent temperatures, the unit may be the wrong size.
  • Excessive Noise: Oversized furnaces may produce more noise than normal.
A qualified technician will be able to assess your home's heating needs. Ask a professional for a load calculation to confirm appropriate sizing. A proper sizing calculation is a worthwhile investment for optimal comfort and energy efficiency.

Why is my furnace blowing cold air?

Possible reasons for cold air include:
  • Pilot light or ignition problems: In older furnaces, the pilot light needs to be lit for the burners to ignite. Ignition issues are a common culprit.
  • Thermostat issues: A faulty thermostat can prevent the furnace from turning on or make it cycle improperly. Check that your thermostat is set correctly and is sending a signal to the furnace to turn on.
  • Overheating: If the furnace overheats, it could activate a limit switch. Overheating can also damage your furnace, so it's best to have a professional inspect the system.
  • Ductwork problems: Leaks in your ductwork can allow heated air to escape into unconditioned spaces, reducing the amount of warm air that reaches your rooms.. This can also result in the furnace blowing cold air, especially if the leak is near the beginning of the ductwork run.
If you're not able to identify the cause and fix the problem yourself, contact a furnace repair professional.

How do I reset my furnace?

Before calling for repairs, consider resetting your furnace. Here's how to reset most furnaces:
  1. Turn off the furnace: Set the thermostat to the 'off' position.
  2. Turn off the power: Locate the circuit breaker for your furnace and switch it off.
  3. Wait: Wait at least 30 seconds, though longer is sometimes recommended for the system to fully power down.
  4. Turn the power back on: Flip the circuit breaker back to the 'on' position.
  5. Turn on the furnace: Turn the thermostat back on and set it to your desired temperature.
If the problem continues after the reset, don't attempt to diagnose or repair the issue yourself.

How do I know when it's time to replace my furnace?

Here are signs that your furnace is nearing the end of its lifespan and may need replacing::
  • Age: If your furnace is 15-20 years old or older, it's likely less efficient and more prone to breakdowns.
  • Frequent Repairs: Repeated service calls can mean underlying problems.
  • High Energy Bills: A spike in your heating bills might be caused by an inefficient furnace.
  • Uneven Temperatures: If you have cold spots, it could indicate problems with your furnace or ductwork.
  • Strange Noises: Banging, squealing, or rumbling noises can signal problems with the blower motor, igniter, or other components..
  • Yellow or Flickering Burner Flame: A healthy furnace flame should be blue. A yellow or flickering flame can indicate a variety of issues. If you notice a yellow flame, contact an HVAC technician immediately..
  • Dry or Dusty Air: An old furnace can contribute to dry, dusty indoor air. Upgrading your system can improve comfort and IAQ.
Don't ignore potential furnace problems.

How can I tell if my furnace is the correct size for my home?

A correctly sized furnace is essential for optimal home comfort. An undersized furnace won't adequately heat the space. An oversized furnace will cycle on and off too frequently, wasting energy and shortening the system's lifespan.. Signs that your furnace may not be correctly sized include::
  • High Energy Bills: An incorrectly sized furnace can lead to increased energy consumption.
  • Inconsistent Temperatures: Noticeable temperature differences throughout your home.
  • Short Cycling: If your furnace cycles frequently, it may not be heating your space efficiently and wasting energy.
  • Poor Air Quality: If the airflow from the vents seems weak or there are areas with inconsistent temperatures, the unit may be the wrong size.
  • Excessive Noise: A furnace that's too large can make loud or unusual sounds
A qualified technician will be able to assess your home's heating needs. Ask a professional for a load calculation to confirm appropriate sizing. Installing the correct size unit will maximize efficiency and minimize energy bills.

Why is my furnace blowing cold air?

Possible reasons for cold air include:
  • Pilot light or ignition problems: In older furnaces, the pilot light needs to be lit for the burners to ignite. In newer furnaces, a faulty electronic ignition system can prevent the burners from igniting.
  • Thermostat issues: An incorrectly set or malfunctioning thermostat can prevent the furnace from turning on or cause it to cycle improperly. Check your thermostat settings to ensure the system is set to 'heat' and the temperature setting is higher than the current room temperature.
  • Overheating: If the furnace overheats, it could activate a limit switch. Overheating can also damage your furnace, so it's best to have a professional inspect the system.
  • Ductwork problems: Leaks in your ductwork can allow heated air to escape into unconditioned spaces, reducing the amount of warm air that reaches your rooms.. This can also result in the furnace blowing cold air, especially if the leak is near the beginning of the ductwork run.
If you're not able to identify the cause and fix the problem yourself, contact a furnace repair professional.

How do I reset my furnace?

Before calling for repairs, consider resetting your furnace. Here's how to reset most furnaces:
  1. Turn off the furnace: Set the thermostat to the 'off' position.
  2. Turn off the power: Locate the circuit breaker for your furnace and switch it off.
  3. Wait: Wait a few minutes for the system to reset.
  4. Turn the power back on: Flip the circuit breaker back to the 'on' position.
  5. Turn on the furnace: Turn the thermostat back on and set it to your desired temperature.
If the problem continues or if you encounter error codes, don't attempt to diagnose or repair the issue yourself.

How do I know when it's time to replace my furnace?

Consider these indicators that your furnace might need replacing:
  • Age: If your furnace is 15-20 years old or older, it's likely less efficient and more prone to breakdowns.
  • Frequent Repairs: Multiple repairs, especially costly ones, suggest it's more economical to invest in a new, more reliable unit..
  • High Energy Bills: A noticeable increase in your heating bills could mean an inefficient furnace.
  • Uneven Temperatures: If some rooms in your house are colder than others, it could be a sign of problems with your furnace or ductwork.
  • Strange Noises: Banging, squealing, or rumbling noises suggest mechanical issues.
  • Yellow or Flickering Burner Flame: A healthy furnace flame should be blue. A yellow or flickering flame can indicate a problem with the burners, insufficient airflow, or a dangerous carbon monoxide leak. If you notice a yellow flame, contact an HVAC technician immediately..
  • Dry or Dusty Air: An old furnace may cause dry, dusty indoor air. A new furnace with improved filtration can help alleviate this problem.
If you're experiencing any of these signs, it's advisable to consult with an HVAC professional for a furnace inspection and assessment.

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