Mini Split Installation in Leonardtown, MD
A new system here will heat from October through April and cool from June through September every year. Tell us about the house, and a licensed contractor who covers St. Mary's County will get in touch.
Tell us about the job
It takes about a minute.
Eleven months of work, most of it heat
In Leonardtown, a mini-split heats the house from October through April, then switches over to cool it from June through September. That is 11 months a year with the compressor working. Winter nights averaging 29°F ask more of the system than the summer side does, since summer afternoons only reach about 86°F.
A new mini-split has to meet the federal minimum for a split-system heat pump, 14.3 SEER2 for cooling and 7.5 HSPF2 for heating. With 62.1% of homes here heating with electricity, that heating side carries real weight.
- 7 months
- October through April, your system heats
- 4 months
- June through September, it cools
- 29°F
- the average winter night it heats against
- 86°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
Maryland requires HVAC contractors to hold a state license.
The Maryland Board of Heating, Ventilation, Air Conditioning, and Refrigeration Contractors tests and records the contractor before that license is issued. It covers the person or company doing the work, not the individual job, so the license tells you the contractor behind your mini-split installation has met the state's standard.
Most cities and counties require a permit for a job like this, along with an inspection once the work is done. That is what stands behind the installation itself, checking it against local code after the licensed contractor puts it in.
Sources: Maryland General Assembly · Maryland Department of Labor
- Is a mini split worth it?
- For most homes, yes, especially if a room runs hot or cold no matter what the rest of the house does. A mini split lets you heat or cool just that space, and it works without ductwork, so it fits additions, garages, and older homes where running ducts isn't practical. Here, homes need heat from October through April and cooling from June through September, so a unit is earning its keep most of the year. Whether it makes sense for your house depends on how it's laid out and what you're trying to fix, so a contractor should look at the specific rooms before you decide.
- How many rooms can a mini split cover?
- A single outdoor unit can run one indoor head or several, depending on the system. Each indoor head heats and cools the room it's mounted in, and you set each one separately, so a bedroom can run warmer than a living room right next to it. How many zones makes sense for your house depends on the layout and how those rooms are used, so a contractor should size the system room by room rather than guessing at a number.
- Can a mini split heat a whole house?
- It can, if it's sized and placed for that job, but a single indoor head mounted in one room won't heat the rest of the house well. Whole-house coverage usually means a multi-zone system with a head in each main area, sized to handle winter nights that average 29°F here from December through February. That's a bigger project than adding one unit to a problem room, so a contractor needs to work out the heat loss for the whole house before recommending how many zones it takes.