HVAC Products We Install for Homes and Businesses
These are the HVAC products Shemtov Systems installs for homes and businesses in Montgomery County, MD, from Carrier and Bryant furnaces, heat pumps and air conditioners to thermostats, humidifiers and air cleaners. Call 240-355-3333 to talk through what suits your home.
Service
High Quality HVAC Products for residential and commercial use
Shemtov Systems installs Carrier and Bryant heating and cooling equipment plus AprilAire air quality products, each with its own page below. This page covers the decisions above those pages: what the label ratings measure, which minimums apply in Maryland, what the 2025 refrigerant change did, and which parts must be replaced together. For advice on your own house in Montgomery County, call 240-355-3333.
Key takeaways
- Carrier and Bryant are both Carrier Global brands, so the platforms overlap heavily.
- Maryland is in the federal Southeast region, where split air conditioners under 45,000 Btu need 14.3 SEER2.
- Gas furnaces are held to 80 percent AFUE now and 95 percent AFUE from December 18, 2028.
- Equipment built from January 2025 uses R-454B, which an R-410A coil cannot pair with.
Which brands does Shemtov Systems install?
Carrier and Bryant are the two heating and cooling lines carried here, and both belong to Carrier Global, which also owns Payne and Heil. The platforms overlap heavily, so the practical difference is the model tiers and the dealer, not the engineering. AprilAire covers air quality with whole house humidifiers and duct mounted media air cleaners. See the furnace, heat pump and residential air conditioning pages.
What do SEER2, HSPF2 and AFUE measure?
Three different things, only one of which applies to any given box. SEER2 is seasonal cooling efficiency. HSPF2 is the heating season equivalent, on heat pumps only. AFUE is the share of fuel a furnace or boiler turns into usable heat across a season. The 2 marks the 2023 test procedure, which loads equipment against higher external static pressure, so the same machine reads lower than under the old scales.
Which efficiency minimums apply in Maryland?
Cooling standards are federal and regional. Maryland is in the Department of Energy Southeast region, where a split system air conditioner under 45,000 Btu must reach 14.3 SEER2 rather than the 13.4 SEER2 national minimum. Split system heat pumps are held nationally to 14.3 SEER2 and 7.5 HSPF2. Gas furnaces must reach 80 percent AFUE, rising to 95 percent for units made on or after December 18, 2028.
What changed when R-410A gave way to R-454B?
From January 1, 2025, new residential air conditioners and heat pumps may not be manufactured or installed with a refrigerant whose global warming potential is 700 or higher. EPA lists R-410A at about 2,090 and R-454B at about 470. The trade is flammability: R-410A is A1, R-454B is A2L, meaning mildly flammable, so the equipment and the training are specific to it. Systems already in service are untouched.
Which parts must be replaced together?
An outdoor unit, an indoor coil and a furnace or air handler are tested together and listed with AHRI as a rated combination, so the SEER2 number belongs to the set, and a new condenser on an old coil gives up the rating. The refrigerant change sharpens that: an R-454B outdoor unit is not approved on an R-410A coil. Selection follows the calculated load, with Manual S choosing equipment and Manual D sizing ducts.
Which products attach to a system you already own?
A thermostat upgrade suits nearly any system, and zoning adds dampers and a second thermostat so two areas hold different setpoints from one system. An AprilAire whole house humidifier feeds moisture into the supply duct. A media air cleaner trades the one inch filter slot for a four inch cabinet; MERV runs 1 to 16, and EPA advises at least MERV 13, or as high as the fan and slot allow.
Frequently asked questions
Can an R-410A system still be repaired?
Yes. The 2025 restriction covers manufacturing equipment and installing new systems, not servicing what is already in place, and R-410A is still sold for that. EPA does step total production down over time, so treat a large recharge as a price that can move.
Are rebates available on high efficiency equipment in Maryland?
EmPOWER Maryland incentives run through the electric utilities, not the state. A 2024 change directed utilities to add incentives for moving off fossil fuel heating, and a 2025 change removed EmPOWER incentives for natural gas equipment. We confirm current amounts when we quote.
Does AprilAire equipment need upkeep of its own?
Yes. A humidifier has a water panel that scales up, plus a solenoid valve and a drain that can clog, and a media air cleaner has a cartridge that loads with dust and costs airflow. Both are usually handled during a seasonal visit.
What paperwork should I keep after an installation?
The model and serial numbers of the outdoor unit, the indoor coil and the furnace or air handler; the AHRI reference number for the combination; and the warranty registration, which is usually time limited from installation.
Talk to Shemtov Systems
To compare equipment against your own house rather than in the abstract, call Shemtov Systems at 240-355-3333.
Homeowner guides
Straight answers to the questions we hear most from Montgomery County homeowners.
- What are the signs your furnace or AC needs repair?
- How much does HVAC replacement cost in Maryland?
- Furnace vs. heat pump: which is better for a Maryland home?
- How long do furnaces and air conditioners last?
- How often should you service your HVAC system?
- What size air conditioner do I need for my home?
- Ductless mini-split vs. central air: which is right for you?
- What are the best thermostat settings for summer and winter?
- Why is my AC not cooling?
- Furnace not working or blowing cold air?
Areas we serve
Shemtov Systems covers Montgomery County and the Washington DC metro.