HVAC Zoning Systems
Motorized dampers and a zone panel so upstairs bedrooms, downstairs rooms and additions each get their own thermostat.
Learn morePasadena neighborhood
Zoning and full system replacement for large homes in South Arroyo, Pasadena 91105
South Arroyo lies in southwest Pasadena along the eastern edge of the Arroyo Seco.
South Arroyo at a glance
- ZIP
- 91105
- City
- Pasadena, CA
- County
- Los Angeles County
- Served from
- Old Pasadena office
- Phone
- (626) 879-0711
- Hours
- Open 24/7
Quick answer
South Arroyo has many large two-story homes from the 1910s to the 1930s along the east rim of the Arroyo Seco. Upstairs rooms often run hot while downstairs stays cool. Marco's designs zoning systems, replaces worn multi-system setups, and installs smart thermostats so each floor holds its own temperature. We quote the price before starting. Call (626) 879-0711 any hour.
Overview
Heating and cooling help in South Arroyo
South Arroyo lies in southwest Pasadena along the eastern edge of the Arroyo Seco. It is a short drive from our Colorado Boulevard office in Old Pasadena, and it is known for its large lots, mature trees and substantial homes in Spanish Revival, Mediterranean, Tudor and Craftsman styles. Some streets sit right on the rim of the Arroyo, with views west toward the hills.
The size and age of these homes create their own heating and cooling challenges. Many have two or even three separate systems added over decades, plus a guest house or converted garage. Upstairs bedrooms bake on summer afternoons while the living room stays comfortable. Rather than replacing equipment piece by piece, we often help owners plan a whole-house approach with zoning, right-sized equipment and controls that make sense for how the house is actually used.
Large period homes and multiple systems
Many South Arroyo homes were built between the 1910s and the 1930s, often two stories with tall ceilings, thick plaster walls, tile roofs and full or partial basements. Original heating was usually a gas furnace in the basement feeding floor or wall registers. Air conditioning arrived later, sometimes as one large system serving both floors and sometimes as separate systems with one furnace in the basement and another in the attic. Guest houses and pool houses may have their own small split system or ductless unit.
With several systems of different ages, it is common to find one unit doing most of the work while another runs constantly. Tile roofs and steep attics also make attic equipment harder to reach.
Common problems
Comfort problems we see in South Arroyo
Hot second floors
Heat rises and attic ducts gain heat. A single thermostat downstairs satisfies the main floor and shuts the system off while upstairs bedrooms stay well above the setpoint.
Mismatched equipment ages
One system may be twenty years old while another is newer. The older one uses more power, breaks more often, and may use a refrigerant that is now expensive to service.
Basement furnace venting issues
Older basement furnaces sometimes share a flue with a water heater or vent through an aging masonry chimney. Poor draft or a deteriorated liner needs a careful inspection.
Hard-to-reach attic units
Steep tile roofs and narrow attic hatches make it difficult to service attic air handlers. Filters get skipped and drain pans go unchecked, leading to clogs and leaks.
Guest house temperature swings
Detached guest houses and studios often have no heat at all or rely on a portable heater. Summer heat builds quickly in small structures with little insulation.
Most requested
Why zoning and planned replacement fit here
A zoning system uses motorized dampers in the ducts and a thermostat on each floor, so the system sends air where it is needed. In a large two-story home, that often fixes the hot upstairs without adding equipment. When systems are near the end of their life, we size new equipment from a load calculation instead of copying the old tonnage, which is often too large. A maintenance plan keeps several systems on one schedule, so filters, drains and burners get checked twice a year, and a ductless unit can bring a guest house into the plan.
Full HVAC System Replacement
Furnace, coil and condenser or a heat pump replaced together as a matched system, with duct testing and the city permit handled.
Learn moreSmart Thermostat Installation
Smart thermostats installed with a proper C-wire and the right heat pump or two-stage settings, tested in every mode.
Learn moreFurnace Replacement
An old furnace swapped for a right-sized new one in the same attic, closet or garage, with venting, ducts and permit handled.
Learn moreDuctless Mini-Split Installation
Ductless heat pumps for Craftsman bungalows, additions, converted garages and hot upstairs rooms, with head styles chosen room by room.
Learn moreHVAC Maintenance Plans
Two visits a year, cooling in spring and heating in fall, so small problems get caught before a heat wave or a cold night.
Learn morePlanning notes for South Arroyo homes
South Arroyo homes are served by Pasadena Water and Power for electricity and SoCalGas for gas. Ask about current PWP or SoCalGas rebates and state heat pump incentives when funding is open, since a multi-system replacement is a good time to compare a heat pump. Some streets fall in historic districts, so we plan condenser placement with that in mind and handle the permit where the city requires one. Title 24 may call for a duct leakage test when equipment is replaced.
Large replacements take careful scheduling. We usually plan them for spring or fall and keep one system running while the other is replaced, so the house is never fully without heat or cooling.
Nearby areas we also cover
Questions
South Arroyo heating and cooling questions
In many South Arroyo homes, yes, if the existing ducts can be split into upstairs and downstairs branches and the equipment has enough capacity. We inspect the duct layout, check return air on each floor, and measure airflow first. Sometimes zoning alone solves it. Other times the best answer is a separate upstairs system or added return air, and we explain why.
Not always. If one system is fairly new and in good condition, replacing only the older one can make sense. Replacing both together can save on labor and permits and lets us match equipment and controls. We look at the age, condition and refrigerant type of each system and give you prices for both approaches before any work starts.
Yes. A ductless mini-split is usually the cleanest option for a guest house or studio because it heats and cools with no ductwork. We size it to the room, find a spot for the outdoor unit that stays quiet and out of view, and handle the permit where the city requires one. We quote the price after seeing the space.
A technician can tell you after an inspection. We check the heat exchanger for cracks, test for carbon monoxide, look at the flue and chimney connection, and confirm proper draft and gas pressure. Many older basement furnaces are still safe, but some show wear that makes replacement the wiser choice. Call (626) 879-0711 any hour to book.
Heating or cooling trouble in South Arroyo?
Call our Pasadena line any hour. A person answers, asks a few questions about the system, and gives you an arrival window.
(626) 879-0711Answering 24 hours, 7 days