Why First-Year Maintenance Matters More
Your new construction HVAC system is under more stress during its first year than at any other point in its life. Construction dust clogs filters faster than normal. Building materials release moisture that the system has to remove. Ductwork connections that were not fully sealed during installation leak conditioned air into the attic. And your builder warranty, the one that covers installation defects at no cost to you, expires in 12 months.
Every maintenance task in this guide serves two purposes: keeping your system running efficiently and building the documentation trail that protects your warranty coverage. Skip a filter change and your system works harder. Skip your annual professional service and your manufacturer warranty may be void. The stakes are higher in year one than they will ever be again.
This guide is written specifically for new construction homes in Houston's growing suburbs: Katy, Conroe, Cypress, Brookshire, Waller, and the communities along the 290 corridor. The climate here, the soil conditions, and the realities of living in an active construction zone all affect what your system needs and how often it needs it.
The Core Maintenance Tasks
These are the tasks that keep your system running and your warranty intact. Each one has a specific frequency, and each one matters more in a new construction environment than in an established home.
Replace Air Filters
New construction generates far more dust than established neighborhoods. Surrounding lots under construction kick up dirt. Drywall dust and paint particles linger in ductwork for months after move-in. Check your filter every 30 days and replace when visibly dirty — do not wait for the 90-day mark printed on the package.
MonthlyFlush Condensate Drain
Pour a cup of white vinegar down the drain line access point. Construction debris and biofilm accumulate in these lines, and a clog during peak summer triggers the safety float switch — shutting down your AC with no warning. A 2-minute flush prevents a $150 emergency call.
Every 3 MonthsClear Outdoor Unit
Maintain 2 feet of clearance around the condenser. Prairie lots in Katy and Brookshire collect construction plastic, tumbleweeds, and grass clippings. Nearby lots under construction blow debris directly at your unit. Restricted airflow forces the compressor to work harder and shortens its life.
Monthly CheckCheck All Vents and Returns
Verify that every supply vent and return air grille is open and unobstructed. Furniture placement, rugs over floor vents, and closed doors in unused rooms create pressure imbalances that reduce system efficiency and can cause uneven temperatures throughout the house.
Every 3 MonthsTest Thermostat Accuracy
Place a standalone thermometer next to your thermostat. If the reading differs by more than 2 degrees, the thermostat may need recalibration or replacement. An inaccurate thermostat causes short cycling or over-running — both waste energy and reduce dehumidification.
Every 3 MonthsProfessional Maintenance
A licensed technician inspects refrigerant levels, electrical connections, coil condition, blower performance, and ductwork integrity. This is the maintenance task that warranty providers check for. No professional service record means no warranty claim — it is that simple.
AnnuallyKeep Every Receipt
Every filter you buy, every professional service you schedule, every maintenance task you complete — keep the receipt or take a photo. If you ever need to file a warranty claim, the manufacturer will ask for proof of maintenance. A folder on your phone labeled "HVAC" takes 10 seconds to set up and can save you thousands.
Month-by-Month: Your First Year
Houston's climate creates distinct seasonal demands on your HVAC system. Here is what to focus on each quarter of your first year, regardless of which month you closed on your home.
Move-In Baseline
Replace the air filter immediately — it has been filtering construction dust since the system was turned on during the build. Locate and photograph the model and serial numbers on your outdoor unit and indoor air handler. Verify that your builder registered the manufacturer warranty. Test the system in both heating and cooling modes. Walk every room and confirm every vent is open and delivering air. This 30-minute walkthrough creates your baseline documentation.
Pre-Summer Preparation
Replace filter. Flush the condensate drain line with vinegar. Clear debris from around the outdoor unit. Check that the drain pan under the air handler is dry and the drain line is flowing freely. If you have a smart thermostat, verify the cooling schedule is set for summer. This is the ideal time to schedule your annual professional maintenance — before every HVAC company in Houston is booked solid in June.
Peak Demand Management
Check and replace filters monthly from May through September — Houston's dust, pollen, and humidity accelerate filter degradation. Monitor your system's behavior: it should run in 15–20 minute cycles, not short 8-minute bursts (which indicate oversizing) or continuously without cycling off (which indicates a problem). Note any rooms that are consistently warmer than others — especially west-facing rooms on prairie lots. If indoor humidity stays above 55% even when the AC is running, you may have a dehumidification problem.
Heating Season and Pre-Warranty Prep
Test your heating mode before the first cold front — do not wait for a freeze to discover a problem. The first time your heater runs in months, it may produce a burning dust smell for 15–30 minutes. This is normal. If it persists beyond 30 minutes or returns on subsequent cycles, have it inspected. Replace the filter. If your builder warranty expires in the next 60 days, schedule a Performance Check now to document any installation issues while the builder is still responsible.
The Critical Warranty Window
This is the most important appointment of your first year. Schedule a professional inspection specifically to document system condition before your builder's one-year warranty expires. A technician should check refrigerant charge, electrical connections, duct integrity, airflow balance, and drain function. Any deficiency found is a warranty claim the builder must address. Any deficiency found after month 12 is your expense. Do not miss this window.
What You Can Do vs What Needs a Pro
Some maintenance tasks are straightforward homeowner work. Others require a licensed technician — and during your warranty period, using an unlicensed person for any repair can void coverage entirely.
Homeowner Tasks
- Replace air filters (monthly check)
- Flush condensate drain with vinegar
- Clear debris from outdoor unit
- Check and open all vents/returns
- Test thermostat accuracy
- Monitor energy bills for spikes
- Document issues with photos
- Keep maintenance receipts organized
Requires a Technician
- Refrigerant level check and charge
- Electrical connection inspection
- Evaporator and condenser coil cleaning
- Blower motor and capacitor testing
- Ductwork integrity inspection
- Airflow balancing between rooms
- Thermostat replacement or rewiring
- Any repair during warranty period
During your warranty period, any work performed by an unlicensed individual — including well-meaning DIY repairs — can void both builder and manufacturer warranties. Even simple tasks like adding refrigerant or replacing a capacitor must be done by a licensed HVAC technician if you want to preserve your coverage. The cost of a service call is a fraction of the cost of a voided warranty.
Houston-Specific Considerations
A maintenance checklist written for Denver or Chicago does not apply in Houston. The subtropical climate, active construction zones, and soil conditions in the Houston metro create specific challenges that generic guides do not address.
Construction Dust Load
If your neighborhood is still being built out — and in communities across Katy, Waller, and Hockley, it probably is — your filters are working harder than normal. Adjacent lot clearing, foundation pouring, and framing generate airborne particulates that your outdoor unit pulls in and your indoor filter catches. Plan on monthly filter changes until the surrounding construction activity settles down.
Humidity Management
Houston's average summer humidity runs 75 to 90% outdoors. Your HVAC system needs to remove moisture in addition to cooling the air. If you notice the house feels clammy even at 72°F, your system may be oversized and short-cycling — running too briefly to dehumidify effectively. Our humidity guide explains why this happens and how to fix it.
Clay Soil and Condensate Lines
Homes on the Katy Prairie and 290 corridor sit on expansive clay that shifts with moisture levels. This movement can affect condensate drain line routing and, in some cases, tilt the drain pan enough to cause pooling instead of draining. Check for standing water in the drain pan during your quarterly inspections — it should always be dry when the system is off.
Salt Air and Coastal Proximity
While not directly on the coast, Houston's proximity to the Gulf means ambient air carries low levels of salt content. Over years, this accelerates corrosion on the outdoor condenser coils and copper refrigerant lines. Annual professional maintenance includes checking for early corrosion — catching it in year one establishes a baseline.
The Cost of Skipping Maintenance
New homeowners often assume a brand-new system does not need maintenance. The system is new, the warranty is in place, and everything works. Here is what skipping maintenance actually costs.
The Math
Annual professional maintenance: $150–$300. Filters for a year: $60–$120. Total first-year maintenance cost: roughly $250–$400.
A voided warranty compressor replacement: $2,500–$4,500. A full system replacement because you could not prove maintenance compliance: $8,000–$15,000. A mold remediation project caused by a clogged condensate line you never flushed: $3,000–$10,000.
First-year maintenance is not an expense. It is insurance on a five-figure asset.
Frequently Asked Questions
My system is brand new — does it really need professional maintenance in year one?
Yes. New systems can have installation issues that only reveal themselves under load — refrigerant charge that is slightly off, duct connections that were not fully sealed, or electrical connections that loosen during the first heating/cooling cycles. Professional maintenance in year one catches these problems while they are still covered under your builder warranty. It also establishes the maintenance record that keeps your manufacturer warranty valid for the next 5–10 years.
What filter should I use?
Use the size and type specified in your system's manual — typically a 1-inch or 4-inch pleated filter. For the first year in a new construction home, a MERV 8 to MERV 11 filter is the right balance between filtration and airflow. Avoid MERV 13+ filters unless your system was specifically designed for them — high-MERV filters restrict airflow in systems not built to handle the resistance, which causes the same problems as a dirty filter.
Can I sign up for a maintenance plan instead of scheduling individually?
Yes, and we recommend it. Our Annual Maintenance Plan at $199/year includes two professional visits (spring and fall), priority scheduling during peak season, and a discount on any repairs. More importantly, it creates an automatic maintenance record — you never have to worry about forgetting to schedule or losing receipts.
What if I find a problem during my own inspection?
Document it with photos and a written description, then contact your builder if you are within the builder warranty period. If the builder warranty has expired, contact a licensed HVAC contractor. Do not attempt to fix it yourself during the warranty period — even well-intentioned repairs by unlicensed individuals can void coverage.
How do I know if my system is working properly?
A properly functioning system in Houston should cool the home to within 3 degrees of the set point, run in cycles of 15–20 minutes or longer, maintain indoor humidity below 55%, and not produce unusual noises, odors, or vibrations. If any of these benchmarks are consistently missed, schedule an inspection.
Start Your First Year Right
Our Performance Check covers everything on this checklist and documents your system's condition for warranty purposes. Schedule before your builder warranty expires.