How long should I wait after changing the filter before my AC starts cooling again?

Give the system 20–30 minutes after changing a severely clogged filter. If the evaporator coil froze due to restricted airflow, you may need to let it thaw for 2–4 hours with the system in fan-only mode before full cooling returns.

My AC runs constantly but can't reach the thermostat setpoint on hot days. Is that normal in Fairfax?

On extreme heat days, it's normal for a correctly sized AC to run nearly continuously. If it's running non-stop on a moderate summer day and still can't catch up, you likely have an airflow problem, a refrigerant issue, or a system sizing problem.

Should I turn my AC off if it's not cooling, or keep running it?

If you suspect a frozen coil, switch to fan-only mode or turn the system off. For other issues like a dirty filter or dirty condenser, you can continue running while you address the fix. When uncertain, fan-only is the safest setting.

How do I verify an HVAC contractor is licensed in Virginia?

Virginia requires all HVAC contractors to hold an active license through the Virginia Department of Professional and Occupational Regulation (DPOR). You can verify any contractor's license status on their website.

Is a heat pump a good replacement for a failing AC in Northern Virginia?

Yes — modern variable-speed heat pumps are well-suited to NoVA's Climate Zone 4A. They qualify for the largest federal tax credits available in 2026 and Dominion Energy offers rebates for qualifying installations.

Back to BlogHome Comfort · Fairfax, VA · Northern Virginia

Moving Into a New House? How to Build a Long-Term HVAC Ownership Plan

Getting organized in your first 30 days means never being caught off guard by a breakdown or a warranty question. The first-month checklist, the one-page equipment record to keep, and how to plan for future replacement costs.

October 14, 2026 By the Fairfax Mechanical Team 9 min read

Short answer: When you move into a new house, build a long-term HVAC ownership plan by identifying your equipment, collecting all available documentation, understanding your warranty coverage, recording the installation dates and system age, and planning for future ownership and replacement costs. Getting organized in your first 30 days means you are never caught off guard by a breakdown, a warranty question, or an end-of-life replacement. Fairfax Mechanical is an experienced, licensed Virginia HVAC contractor that helps new Northern Virginia homeowners understand and plan for their HVAC system, starting with a baseline assessment and a maintenance plan that protects it from day one.

Moving into a new house? Build a long-term HVAC ownership plan

Congratulations on your new Northern Virginia home. Between unpacking boxes and setting up utilities, there is one major home system that is easy to overlook but well worth getting organized early: your HVAC.

The heating and cooling system is one of the most expensive systems in any home to repair or replace, and taking a little time in your first month to understand and document it sets you up for years of reliable comfort, protected warranties, and smart budgeting.

Why a plan matters from the very first month

Your HVAC system quietly runs your home's comfort every day, and it is one of the costliest systems to replace. Knowing its age, condition, fuel type, and warranty status lets you budget and plan proactively instead of reacting to expensive surprises.

New homeowners who get organized early avoid the two worst outcomes: a mid-winter furnace failure they never saw coming, and discovering too late that the warranty lapsed or the system was already near the end of its service life.

Thirty minutes now, years of certainty

Almost everything on this checklist can be done in your first month, before the first cold snap, while the weather is still forgiving.

Your first-30-days HVAC checklist

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Locate all your equipmentFind the furnace or air handler, the outdoor AC or heat pump condenser, and the thermostat. Some homes have a boiler or multiple systems.
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Record the model and serial numbersPhotograph the data plate on each unit for your records and future service calls.
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Determine the installation date and ageFrom the data plates or any documents, so you know how much service life likely remains. Furnaces last roughly 15 to 20 years, and AC units and heat pumps about 15.
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Collect documentationAsk the seller or builder for invoices, warranties, permits, manuals, and maintenance records.
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Check warranty coverageIs any equipment still under a manufacturer warranty, and is it transferable to you as the new owner? Some warranties require a transfer step.
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Locate the electrical panel and the HVAC breakers and shutoffs
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Find and check the air filterNote its size and replace it, so you are starting fresh and protecting airflow.
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Identify your fuel type and system typeGas furnace, electric, heat pump, dual-fuel, or boiler.
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Confirm carbon monoxide detectorsPresent and working on every level. This is essential for any gas furnace or boiler.
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Schedule a baseline professional assessmentTo understand the system's true condition and remaining life.

Your simple HVAC equipment information sheet

Keep a one-page record, digital, printed, or both, with:

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Equipment typeFurnace, AC, heat pump, or boiler
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Brand, model, and serial numbers
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Installation date and current age
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Fuel typeGas, electric, or dual-fuel
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Air filter size
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Warranty status and expiration
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Installing or servicing contractor contact
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Maintenance historyAdd to it after each visit

Planning for future ownership costs

Knowing your system's age is the key to budgeting. If your furnace is already 15 or more years old, or your AC is approaching 15, a replacement may be on the horizon. Planning for it early, while learning about the federal 25C tax credit of up to $2,000 on a qualifying heat pump and Dominion Energy rebates, beats scrambling after a sudden failure.

Setting up annual maintenance from the start protects the equipment, keeps manufacturer warranties valid, catches small issues before they become breakdowns, and extends the system's life. It is the cheapest insurance a new homeowner can buy.

Why choose Fairfax Mechanical

We are an experienced, licensed Virginia HVAC contractor, and we help new Northern Virginia homeowners start off right, with a baseline system assessment, help understanding your equipment and warranty, a maintenance plan that protects it, and honest planning for future costs. We serve Fairfax and all of Northern Virginia.

“New homeowners who spend an hour on the HVAC in month one are the ones who never get the 2 a.m. January surprise call.”Fairfax Mechanical Technical Team, Fairfax, VA

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Frequently Asked Questions

What should I do with my HVAC first after moving in?

Locate the equipment, record the model and serial numbers, find and replace the air filter, and check that carbon monoxide detectors are working on every level. Then schedule a baseline professional assessment.

How do I know how old my HVAC system is?

Check the data plate on each unit for a manufacture date, or use the serial number, and look through any documents the seller left. A furnace typically lasts 15 to 20 years, and an AC or heat pump about 15.

Is the previous owner's warranty transferable to me?

Sometimes. Some manufacturer warranties transfer to a new owner, but many require a transfer step within a certain window. Check the warranty documents and confirm the status rather than assuming.

Why is a baseline assessment worth it on a new home?

It tells you the system's real condition and remaining life, so you can budget proactively instead of reacting to a surprise failure. On a system you will rely on for years, it is inexpensive insurance.

Why choose Fairfax Mechanical?

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