What’s the best thermostat setting for summer in Newcastle?

For optimal comfort and energy savings during summer in Newcastle, set your thermostat to 78°F (25°C) when you're home. If you're away, raising it to 85°F can help reduce cooling costs. Using a programmable or smart thermostat can make these adjustments automatic and more efficient.

Do you provide emergency after-hours HVAC service in Newcastle?

We are available 24/7 to take your call for emergencies. Our appointment hours are listed above.

How can I improve indoor air quality in Newcastle?

To improve indoor air quality in Newcastle, start by regularly changing your HVAC filters, scheduling routine maintenance, and using air purifiers. Consider duct cleaning if your home has excessive dust or allergy symptoms. Proper ventilation and keeping your home clean are key to healthier air.

How often should I service my HVAC system in Newcastle?

It’s ideal to service your cooling system each spring and your heating system each fall to ensure you find small issues before they become big problems.

Do you offer HVAC financing in Newcastle?

We work with several lenders to provide financing options for qualifying customers. Ask your technician about your financing options.

How often should I have my furnace serviced in Newcastle?

It’s recommended to have your furnace professionally serviced once a year, ideally in the fall before the heating season begins in Newcastle. Annual maintenance helps ensure safe operation, improves efficiency, and can extend the life of your system.

How often should I have my air ducts cleaned in Newcastle?

It’s generally recommended to have your air ducts cleaned every 3 to 5 years in Newcastle, or more often if you notice dust buildup, allergies, or musty odors. Homes with pets, recent renovations, or high pollen levels in Tukwila may benefit from more frequent cleanings to maintain healthy indoor air quality.

How often should I schedule AC maintenance in Newcastle?

You should schedule AC maintenance once a year, ideally in the spring before the cooling season starts. Regular tune-ups help your system run efficiently, prevent breakdowns, and extend the life of your unit, especially important in Newcastle's summer climate.

What size HVAC system is right for my home in Newcastle?

The right HVAC system size for your home in Newcastle depends on factors like square footage, insulation, number of windows, and local climate. A professional load calculation ensures your system is properly sized for comfort and efficiency. Oversized or undersized units can lead to higher energy bills and uneven temperatures.

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Bringing Comfort Home

Newcastle HVAC Services

One Hour Heating & Air Conditioning® of Newcastle

(86 reviews)

Heating & Cooling

Services By One Hour

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HVAC Emergencies

Fast 24/7 emergency HVAC repairs to restore your comfort when you need it most today.
Air Conditioning

Reliable air conditioning services to keep your home cool and comfortable all year.
Thermostat Repair

Expert thermostat services for precise temperature control and maximum energy savings.
Indoor Air Quality

Comprehensive air quality solutions for healthier, cleaner indoor air in your home.
Heating

Professional heating services to keep your home warm and comfortable year-round.

Newcastle AC Services

Air Conditioning Repair, Installation & Maintenance

When homeowners want a reliable air conditioning and heating system that they don’t have to think about, they call One Hour Heating & Air Conditioning. We are the leading HVAC service provider in the Newcastle and the surrounding areas for a simple reason: we actually care about your comfort.

At One Hour Heating & Air Conditioning® of Newcastle, we respect you, we respect your time, and, most importantly, we respect the trust that you put in us to keep your home comfortable. It’s why we back all of our work with a 100% customer satisfaction guarantee for two years, and it’s why we’re always on time—guaranteed.

One Hour Heating & Air Conditioning technician Checkin HVAC.

Hours of Operation

We are available 24/7 to take your call for emergencies. For all other services, our appointment hours are:

Monday

24 hours

Tuesday

24 hours

Wednesday

24 hours

Thursday

24 hours

Friday

24 hours

Saturday

24 hours

Sunday

24 hours

Special Offers

Mention these discounts at time of service

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$0 Down 0 payments for 12 months.

New system installation as low as Zero down, zero payments for 12 months.

Start your project now and pay nothing for 24 months. Terms and conditions apply. Financing is subject to credit approval. Financing is provided by one or more third-party lenders, not by Authority Brands.
$500 Off New AC Replacement

Save $500 on a new high efficiency system and enjoy reliable comfort year round.

Valid at participating locations. Limit one coupon per household. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Some restrictions, taxes and fees may apply.
$100 Off repair

Take $100 off your repair and get your system running quickly and efficiently.

Valid at participating locations. Limit one coupon per household. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Some restrictions, taxes and fees may apply.
Premium Service Plan

Premium Plan – $21.99/mo ($264/yr) • Annual A/C & heating maintenance • Standard 1" filter per visit • Thermostat batteries & programming • No standard trip/diagnostic fees • 15% discount on repairs • Up to $500 replacement credit • 2-year repair warranty • Priority scheduling • Safety & airflow inspection • Emergency response priority

Membership services listed and plan discounts vary and may change based on individual franchise location. Membership renewal period is one year. Cannot be combined with any other offer. Not redeemable for cash. Valid only at participating locations.
Heroes Service Plan

Hero Plan – $17.99/mo ($216/yr) • Annual A/C maintenance • Annual heating maintenance • Standard 1" filter per visit • Thermostat batteries & programming • No standard trip/diagnostic fees • 15% discount on repairs • Up to $500 replacement credit • 2-year repair warranty • Priority scheduling • Safety & airflow inspection • Emergency response priority

Membership services listed and plan discounts vary and may change based on individual franchise location. Membership renewal period is one year. Cannot be combined with any other offer. Not redeemable for cash. Valid only at participating locations.
Basic Service Plan

Basic Plan – $15.99/mo ($192/yr) • Annual A/C or heating maintenance • Standard 1" filter per visit • Thermostat batteries • 2-year repair warranty • Standard scheduling • Safety & airflow check

Membership services listed and plan discounts vary and may change based on individual franchise location. Membership renewal period is one year. Cannot be combined with any other offer. Not redeemable for cash. Valid only at participating locations.

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Newcastle HVAC Services You Can Count On

Our customers love what we do because we treat them like the neighbors they are to us. While we carry the One Hour name, we're an independently owned and operated business with a personal investment in the local community. We back our work with a 100% satisfaction guarantee, provide StraightForwardPricing® guides for your benefit, and will pay you back for being even one minute late to an appointment.

We have a reputation for being punctual, friendly and knowledgable

(86 reviews)

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Devon was always prompt with responding to my questions and keeping me informed. Nick the installer was the kindest hardworking young man explaining everything sometimes twice and letting me and hubby know why it took another half day to complete the project.

Liz

4 months ago

Devin and his team are the best heating company that I ever worked with. We were so stressed out in our cafe project. He took the time to explain everything we need, explained our options, and went above and beyond with his customer service, knowledge of the work he is doing, not to mention a price that doesn’t break your bank. Thank you so much for all the hard work and I look forward to work with you in my residential work!

um ahlam

4 months ago

Update - The team reached out and immediately helped us out. Very impressed that they took my feedback seriously and worked on it. I appreciate the apology and their assistance. Felt like they truly cared. Appointment process was okay the first time, for follow up questions and quotes, I keep calling and emailing. The guys who came gave decent service but overall, would prefer someone who communicates better.

Karishma Sakaria

3 weeks ago

It’s really great to have your professional services. You’re really efficient and smart in solving problems regarding the heater issue. Thank you for your professionalism and support.

D Mike

3 months ago

I highly recommend this company. We had them service our two gas fireplaces. One needed some minor repairs which they handled without issues. They were also VERY reasonable when it came to cost and their professionalism and customer service was amazing.

Dee Mullins

a month ago

Here For You

When You Need Us Most!

Yellow One Hour Heating & Air Conditioning service van with company branding and slogan.

'Round the Clock Availability

No matter the hour, you can trust One Hour to be there to help you when you get hit with the unexpected.
100% Satisfaction Guarantee

We guarantee our materials, labor, and craftsmanship for up to two years from the date of your service.
StraightForward Pricing® Guide

Before we start any work, we discuss your available options so you know exactly what you are getting and how much it will cost. No hidden fees!
Always On Time…Or You Don’t Pay A Dime!®

We understand your time is valuable, so we promise to arrive at your home within the predetermined time window that you select, or your service call is free.

Financing Available!

Prioritize your comfort without fronting the entire bill on day 1 – contact us today to learn more about financing options.

Discover Your Options

Meet the Newcastle Team

Best HVAC Team in King County.

We are a local, veteran-owned HVAC team proudly serving King County and the Eastside communities. Built on discipline, integrity, and attention to detail, our team is committed to delivering premium heating and cooling solutions with a focus on quality workmanship and customer care.

Our technicians are professionally trained, background-checked, and dedicated to doing the job right the first time. Whether it’s a routine maintenance, complex repair, or full system installation, we approach every home with respect, precision, and a problem-solving mindset.

At our core, we believe HVAC is not just about equipment—it’s about comfort, health, and peace of mind. That’s why we take the time to educate our customers, provide honest recommendations, and stand behind our work with strong guarantees.

Our mission is simple: deliver reliable comfort, build long-term relationships, and set the standard for HVAC service in our community.

HVAC Near Me In...

One Hour Heating & Air Conditioning® of Newcastle services the following communities:

Bellevue
Newcastle
Renton
Mercer Island
Medina
Clyde Hill
Hunts Point
Yarrow Point
Beux Arts Village
Newport Shores
Factoria
Newport Hills
Somerset
Cougar Hills
Lakemont
Coal Creek
Coalfield
May Creek
Kennydale
East Renton Highlands

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Expert Tips

Learn From Our HVAC Experts

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Air Quality

Knowing When and How to Upgrade Your HVAC System

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AC Revitalization: A Practical Guide to Keeping Your Home Cool, Efficient, and Comfortable

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Air Conditioners

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Servicing your entire home

Part of the Authority Brands Family

Authority Brands is the leading provider of in-home services, building brands that support the success of franchisees as well as better the lives of the homeowners we serve and the people we employ.