Maintenance Is the Cheapest HVAC Investment You'll Make
I'm Omar Jacobo, owner of Frosty's HVAC (EPA 608 #2396328), and I'll be straight with you: most HVAC breakdowns I see across Farmers Branch, Coppell, Irving, Flower Mound, Lewisville, and Grapevine are preventable. A system that gets annual maintenance lasts 15-20 years. A neglected system? I've pulled out 8-year-old units that were completely shot because nobody ever changed the filter or cleaned the coils.
Below is the checklist I recommend for every Texas homeowner. I've split it into what you can handle yourself and what needs a licensed professional. Do the DIY items monthly or seasonally. Schedule a pro for the rest at least once a year — twice if your system is over 10 years old.
DIY Tasks: What You Can Do Yourself
These tasks require no tools, no expertise, and no license. If you do nothing else, do these.
1. Replace Your Air Filter (Every 1-3 Months)
This is the single most important thing you can do for your HVAC system. A clogged filter restricts airflow, forces the system to work harder, increases your electric bill, and can cause the system to overheat and shut down. In DFW, where we deal with high pollen counts (we're a top-20 allergy city in the U.S.), pet dander, and construction dust, filters get dirty fast.
- 1-inch filters: Replace every 30 days during heavy-use months (June-September), every 60-90 days in mild months.
- 4-inch filters: Replace every 3-6 months.
- Recommended MERV rating: 8-11 for most homes. Higher isn't always better — a MERV 13+ filter in a system not designed for it restricts airflow just like a dirty filter.
Your filter is located at the return air grille (wall or ceiling) or in a slot at the furnace in your attic or closet.
2. Keep the Outdoor Unit Clear (Monthly in Spring/Summer)
Your outdoor condenser unit needs at least 2 feet of clearance on all sides for proper airflow. Trim back shrubs, pull weeds, remove leaves and grass clippings. In DFW, cottonwood fluff (those white fluffy seeds that fly around in May-June) clogs condenser coils fast. Gently spray the coils with a garden hose from the inside out — never use a pressure washer, which will bend the fins.
3. Check Your Thermostat Settings (Seasonally)
When you switch from cooling to heating (usually October-November in Texas) and back to cooling (March-April), check that your thermostat is set correctly. Set the fan to "Auto" — not "On." With the fan on "On," the blower runs continuously and blows unconditioned air between cycles, wasting energy and making your home feel uncomfortable.
If you have a Frosty Thermostat (included with all our installations), you can monitor and adjust settings from your phone.
4. Inspect Visible Ductwork (Twice a Year)
If you can safely access your attic, look at your ductwork. Most DFW homes built before 2000 have grey flex duct that deteriorates over time. Standard duct tape (ironically) fails in attic heat — it dries out and falls off. Look for disconnected joints, crushed sections, visible holes, or insulation that's fallen off. Leaky ducts waste 20-30% of your conditioned air into the attic.
If you see problems, don't try to fix ductwork yourself — improper sealing can make it worse. Read our Ductwork Health Guide for more on what to look for.
5. Clear Condensate Drain Line (Every Spring)
Your AC produces condensation that drains through a PVC pipe, usually exiting near your outdoor unit or through a wall. If this line clogs (algae growth is the usual culprit in humid Texas summers), water backs up into the drain pan and can overflow into your attic or closet, causing water damage. Pour a cup of white vinegar down the drain line opening every spring to prevent algae buildup.
6. Test Your System Before Peak Season
Don't wait until the first 95°F day to discover your AC doesn't work. In early March, turn on the cooling and let it run for 30 minutes. Check that cold air is coming from the vents and the outdoor unit is running. In October, switch to heat and do the same — you may notice a slight burning smell when the furnace fires up for the first time (dust on the heat exchanger burning off), which is normal for the first few minutes.
Professional Tasks: What Needs a Licensed Tech
These tasks require tools, training, and in many cases an HVAC license. Don't attempt them yourself — you can damage equipment or create safety hazards.
1. Refrigerant Level Check
Your AC system is a hermetic (sealed) system. If refrigerant is low, it doesn't mean it "used up" the refrigerant — it means there's a leak. A technician will check refrigerant pressure, and if it's low, locate the leak first, repair it, then recharge to manufacturer specifications. Anyone who just tops off the refrigerant without finding the leak is wasting your money — the gas will leak right back out. A refrigerant leak repair plus recharge costs $350-$1,000 depending on the leak location.
2. Electrical Component Inspection
Capacitors, contactors, wiring connections, and voltage readings all need to be checked annually. A weak capacitor is the #1 cause of AC breakdowns in DFW summers — it's a $500 fix if caught during maintenance, but if it fails in July, it can take out the compressor ($3,500-$5,000) along with it. A contactor replacement runs $600.
3. Evaporator and Condenser Coil Cleaning
Your evaporator coil (the indoor coil in your attic or closet) and condenser coil (the outdoor unit) both need professional cleaning. Dirty coils reduce efficiency by 20-30% and force the compressor to work harder. You can hose off the outdoor unit yourself, but the evaporator coil requires chemical cleaning and access to the indoor cabinet.
4. Furnace Combustion and Safety Check
A tech should inspect the heat exchanger for cracks (which can leak carbon monoxide), test the flame sensor and ignitor, check gas pressure, and verify proper combustion. Heat exchanger replacement costs $2,500-$4,000, but a crack caught early can prevent a dangerous CO leak. Read our furnace troubleshooting guide for more details.
5. Blower Motor and Fan Inspection
The blower motor drives airflow through your entire duct system. A technician checks amp draw, bearings, and speed settings. A fan motor replacement costs $650-$2,800, and a blower motor runs $750-$1,500 (ECM motors up to $2,800). Catching bearing wear early saves the motor.
Spring AC Prep Checklist (Do This in March-April)
- Replace air filter
- Clear debris from outdoor condenser unit (2-foot clearance)
- Rinse condenser coils with garden hose
- Pour vinegar down condensate drain line
- Switch thermostat to "Cool" and test for 30 minutes
- Inspect visible ductwork in attic
- Schedule professional tune-up (refrigerant, electrical, coil cleaning)
Fall Heating Prep Checklist (Do This in October-November)
- Replace air filter
- Switch thermostat to "Heat" and test for 15 minutes
- Check for unusual smells (brief dust-burning is normal; persistent odors are not)
- Test carbon monoxide detectors and replace batteries
- Inspect visible ductwork in attic
- Schedule professional furnace inspection (heat exchanger, ignitor, flame sensor, gas pressure)
Let Frosty Club Handle the Pro Side
Our Frosty Club Premium membership ($300/year) includes 2 professional tune-ups per year — one in spring for your AC and one in fall for your furnace. That covers all the professional tasks listed above. You also get $500 off any repair, 15% off parts, priority scheduling, and no overtime charges.
The Basic membership ($99/year) gets you 10% off any repair and priority scheduling — a great option if you want the savings without the included tune-ups.
We've had 94 Google reviews with a 4.9-star rating since opening in January 2018. Maintenance customers are how we keep that rating — because a well-maintained system rarely has emergencies.
Questions?
Call us at (469) 254-0548. We serve Farmers Branch, Coppell, Irving, Flower Mound, Lewisville, and Grapevine.
— Omar Jacobo, Owner, Frosty's HVAC | EPA 608 #2396328 | TACLA126718E