Hyattsville HVAC FAQs | Sizing, Permits, Costs | Swellfort

Frequently Asked Questions — Swellfort Heating & Air Conditioning

Most HVAC questions have a real answer that a contractor could give you in two minutes — and a vague one that keeps you dependent on them. This page is the first kind. These are the questions we actually get from homeowners across Hyattsville and Prince George’s County, answered with the specifics of this climate and this housing stock rather than generic filler. If your question is not here, call us at (227) 249-1654 and we will answer it the same way.

Sizing, Comfort & Humidity

Why is my house cold but still humid in the summer?
This is the most common complaint we hear, and it almost always means your air conditioner is oversized. Prince George’s County sits in Climate Zone 4A, where the summer design condition includes a wet bulb near 76°F — meaning a large part of the cooling load is moisture, not heat. An oversized unit cools the air to temperature in a few minutes and shuts off before it has run long enough to pull water out of the air. You end up at 72°F and 60–65% humidity, which feels clammy. The fix is proper sizing by a Manual J load calculation, and sometimes a dedicated dehumidifier.
Why won’t my second floor get as cool as the first?
In Hyattsville’s post-war ramblers and split-levels, this is usually a ductwork problem, not an equipment problem. These homes were built with a single undersized central return, so there is not enough return airflow to properly condition the upper level. We measure static pressure to confirm it, and the solution is typically adding a return path and resizing ducts rather than buying a bigger system that would only make the humidity worse.
Is a bigger system always better?
No — in this climate, bigger is usually worse. An oversized system short-cycles, fails to dehumidify, wears out its compressor faster, and costs more up front and to run. The right size is the one that matches your home’s actual measured load, which is why we run a room-by-room Manual J calculation before recommending any equipment rather than matching whatever was there before.

Repairs, Replacement & Refrigerant

Should I repair my old system or replace it?
It comes down to age, the cost of the repair, and the refrigerant. If your system is under about twelve years old and the repair is minor, repair. If it is older, running R-410A or R-22, and facing a major failure like a compressor or heat exchanger, replacement often makes more sense once you factor in energy savings, avoided future repairs, and available rebates and tax credits. We give you the honest numbers both ways rather than steering you toward the bigger sale.
R-410A is being phased out — do I need to replace my system now?
No. Under the AIM Act, new equipment now uses lower-GWP refrigerants like R-454B, but R-410A remains legal to service on existing systems. Supply will tighten and prices will rise over time, which matters for repair-versus-replace math on older units, but your current system does not suddenly become unserviceable. If it is holding charge and under about twelve years old, keep running it.
How long should an HVAC system last?
In this climate, a well-maintained air conditioner or heat pump typically lasts 12 to 15 years, and a furnace 15 to 20. Systems that were oversized, poorly installed, or never maintained fail earlier. Humidity accelerates certain failures here too — formicary corrosion can put pinhole leaks in an evaporator coil well before the rest of the system is worn out. Annual maintenance is the single biggest factor in reaching the top of those ranges.

Permits, Licensing & Cost

Do I need a permit to replace my HVAC system?
Yes. Equipment replacement in Hyattsville and surrounding Prince George’s County municipalities requires a mechanical permit through the county Department of Permitting, Inspections and Enforcement, and gas work requires separate WSSC Water gasfitter licensure. We pull the permit and handle the inspection on every installation. Unpermitted work commonly causes problems later during a home sale, so this protects your resale value as well as your safety.
How much does a new HVAC system cost?
It depends on the size of your home, the type of system, the condition of your existing ductwork, and the efficiency level you choose — which is why an honest quote requires an in-home assessment rather than a number over the phone. What we can tell you is that the price should reflect available EmPOWER Maryland rebates and the federal 25C tax credit, which we calculate into the proposal up front. We also offer financing so the cost can be spread over manageable monthly payments.
Do you offer free estimates?
For system replacements and installations, yes — we provide a free in-home assessment that includes the load calculation and a detailed proposal. For diagnostic service calls on a broken system, there is typically a diagnostic fee that covers the technician’s time to properly measure and identify the problem, and that fee is applied toward the repair if you proceed. Call (227) 249-1654 and we will explain exactly what applies to your situation.

Maintenance & Service

How often should I have my system serviced?
Once a year at minimum, and ideally twice — cooling in spring, heating in fall — if you have both a furnace and an air conditioner or a heat pump. Annual maintenance catches small problems before they become failures, keeps the system efficient, and satisfies the documented-maintenance requirement in most manufacturer warranties. A tune-up that finds a weak capacitor or a low charge is far cheaper than the compressor failure it prevents.
What areas do you serve?
We work out of our office in the 20783 corridor and serve Hyattsville, Chillum, Langley Park, Adelphi, Mount Rainier, and Riverdale Park, along with surrounding Prince George’s County communities. Because the office sits between Chillum and Langley Park, response to the nearest neighborhoods is typically fastest.
What should I do if I smell gas or suspect carbon monoxide?
Treat both as emergencies. If you smell gas, leave the house immediately, do not operate any electrical switches, and call 911 and Washington Gas from outside. If your carbon monoxide alarm sounds or anyone has symptoms like headache, dizziness, or nausea, get everyone out into fresh air and call 911. Do not attempt to diagnose either yourself. Once the immediate danger is cleared by the utility or fire department, we can inspect the system, check the venting and heat exchanger, and correct the underlying cause.

Still Have Questions? — Hyattsville, MD

If your question is not answered here, call and we will give you the same straight answer in person — no jargon, no runaround.

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Office Hours

  • Monday – Saturday: 9:00 AM – 5:00 PM
  • Sunday: Closed