Seasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
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AfterFast, Reliable AC Installation Across Redmond
Most AC installations in Redmond run $3,500-$7,500 for a complete system, and every job starts with a written price before any work begins. We’re Coldharbour Heating & Air, and our AC Installation crews work Redmond neighborhoods from Education Hill to Bear Creek to Overlake every week. Scheduling runs through our Seattle office, but the technicians who show up at your door live and work this side of Lake Washington. They know the 1990s tract homes, the damp crawl spaces off the Sammamish River valley, and the King County inspection requirements that catch unprepared installers. Call (817) 402-2972 for a free estimate, or keep reading to see why a straight swap of your old furnace for AC often fails in Redmond’s specific housing stock.
Why Coldharbour Heating & Air Is Redmond’s Preferred AC Installation Company
We’ve been part of the Kingswell network since 2003, and our independently owned operation has built a reputation in Redmond on one thing: doing what we said we’d do. That means a live person answers the phone at midnight on a Saturday, a uniformed technician arrives in the window we gave you, and the price on the paper is the price at the door.
Our 365-Day Done Right Promise applies to every repair we perform, written down before the technician leaves. If a repair fails within that full year, we come back and correct it at no charge. No argument, no additional invoice. That’s The Kingswell Way, and it’s how we operate in Redmond and every community we serve.
Dispatch and scheduling for Redmond jobs runs through our Seattle office, but the crew that arrives at your home knows the local terrain. They’ve balanced blowers on oversized ducts in Bear Creek crawl spaces, passed King County inspections on Education Hill retrofits, and traced static-pressure problems through trunk lines that were never designed for cooling airflow. That local familiarity saves hours on every job, and it means we don’t discover your home’s quirks on your dime.
HVAC Installation in Redmond
HVAC Installation in Redmond has shifted dramatically in the past five years, driven by two forces: the 2021 heat dome that pushed temperatures past 100°F in this area, and Washington State’s clean-building mandates pushing new construction away from gas equipment. Most Redmond homeowners calling us now aren’t adding AC to an existing cooling system. They’re retrofitting heat pumps into 1985-2005 homes that were built with gas furnaces only, on the assumption the Pacific Northwest would never need mechanical cooling.
The challenge is that these homes, particularly on Education Hill and around Overlake, were ducted for heat distribution only. The trunk lines are oversized for the gentle airflow of a single-stage furnace, and the return-air capacity was never sized for the higher CFM a heat pump air handler demands. A proper HVAC Installation here starts with a Manual J load calculation and a blower-speed audit, not with picking a tonnage rating off the old unit’s nameplate.
Load Calculations Before Equipment Selection
We run a full Manual J on every Redmond install. The old rule of thumb, one ton per 400 square feet, ignores the solar gain on west-facing Education Hill windows, the insulation degradation in 1990s tract construction, and the duct leakage that robs capacity in damp crawl spaces. Our written proposal includes the load calculation, the equipment match, and the price. No surprises.
Duct Modifications for Heat-Only Homes
Retrofitting cooling into a heat-only duct system often requires reconfiguring trunk lines, adding return-air pathways, or sealing duct boots that have been leaking valley moisture since the Clinton administration. We handle this in-house, and we price it upfront. The alternative, skipping this step, means a system that short-cycles, fails inspection, or never cools the second floor.
Heat Pump Installation in Redmond
Heat Pump Installation in Redmond is now the dominant HVAC job we perform, and for good reason. Washington’s electrification push, combined with Puget Sound Energy rebates, makes heat pumps the practical replacement for aging gas furnaces. But a heat pump is not a furnace with a cooling coil strapped on. It moves heat rather than generating it, which means it needs more airflow across the indoor coil, more precise refrigerant charge, and a duct system that can handle both heating and cooling modes without choking the air handler.
On a two-story 1994 Bear Creek build off Novelty Hill Road, our crew found the original 100,000 BTU single-stage Lennox furnace running on oversized trunk lines sized purely for heating. We ran a manual J load calculation and a blower-speed audit, sealed and reconfigured duct runs through the damp crawl space, then set a Carrier heat pump and dialed the refrigerant charge and thermostat calibration to the new airflow. The house finally held consistent cooling upstairs without short-cycling the compressor.
Refrigerant Charge and Airflow Balance
Heat pumps are unforgiving about charge and airflow. In Redmond’s climate, where the system heats eight months and cools two, the charge must be precise for both modes. We weigh in the charge, verify superheat and subcooling, and balance dampers so the second floor doesn’t roast while the first floor freezes. King County inspectors check this. We pass the first time.
Electrical Panel Readiness
Many Redmond homes from this era have 100-amp panels with no spare breaker slots. A heat pump needs a dedicated 240-volt circuit, and the air handler may need its own feed if the existing furnace circuit is undersized. We assess this during our initial site visit, include any panel work in the written price, and coordinate with licensed electricians when needed. You don’t find out about this after the old equipment is already disconnected.
Trusted Brands We Service in Redmond
Our technicians train on nine major residential HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For Redmond installations, we typically recommend Goodman or Rheem for their value in retrofit applications, or Daikin for variable-speed heat pump performance in homes with challenging duct systems. We stock common parts locally, which means if a warranty issue arises on your new system, we’re not waiting two weeks for a control board from Texas. Our relationship with regional distributors gets us next-day availability on most components, and our trucks carry the consumables that fail first: capacitors, contactors, and refrigerant. When you call (817) 402-2972, you’re reaching a team that can actually fix what we install.
Common AC Installation Problems We See in Redmond Homes
- Oversized trunk lines choking heat pump airflow. The 1990s furnaces in Education Hill and Bear Creek homes were paired with ducts sized for gentle heat distribution. When a heat pump air handler tries to push cooling CFM through those same trunk lines, static pressure spikes and the evaporator coil starves. We measure this with a manometer and reconfigure before the new system goes in.
- Crawl-space moisture destroying duct capacity. Redmond’s position in the Sammamish River valley holds morning fog longer than Bellevue or Kirkland, keeping crawl spaces damp from October through April. Duct boots sealed with 1990s tape have failed, leaking conditioned air into the dirt and growing mold that homeowners don’t discover until we pull the old furnace. We seal with mastic and proper mechanical fasteners, not tape.
- Single-zone systems fighting unbalanced floor plans. Two-story Redmond tract homes with all-day sun on the second floor and tree shade on the first need zoned airflow, not a single thermostat downstairs. A like-for-like tonnage swap ignores this and leaves the upstairs hot every July afternoon. We address this with damper zoning or multi-stage equipment.
- Electrical panels that predate cooling loads. The 100-amp panels common in 1990s Redmond construction were never designed for a 30-amp heat pump circuit plus the existing electric loads. We check panel capacity, bus bar condition, and available breaker space during our first visit, and we include any upgrade work in the written price.
Pricing for AC Installation in Redmond, WA
A typical AC or heat pump installation in Redmond runs $3,500-$7,500, depending on equipment size, duct modifications, and electrical work. This is not a guess. It’s the range we see on actual Redmond jobs, from a straightforward Goodman split system in a home with adequate ductwork to a full Daikin heat pump retrofit with trunk-line reconfiguration and panel upgrade.
| Service | Price Range in Redmond |
|---|---|
| AC Installation | $3,500 - $7,500 |
| AC Repair | $150 - $650 |
| Tune-Up | $80 - $200 |
What moves the needle within that range? Equipment efficiency rating, duct modification complexity, electrical panel work, and whether we’re accessing a crawl space or attic. Every proposal we write breaks these out line by line. The price you sign is the price you pay. Call (817) 402-2972 for a free, no-obligation estimate at your Redmond home.
We Also Serve Cities Near Redmond
Our crews work throughout the Eastside, including AC Installation in Redmond and surrounding communities. We regularly install systems in Kirkland, Sammamish, Bellevue, and Medina, and we understand the distinct housing stock and climate conditions in each. Kirkland’s waterfront homes face salt-air corrosion on coastal condensers. Bellevue’s hillside construction creates drainage challenges for outdoor units. Sammamish’s newer builds have tighter envelopes but smaller mechanical rooms. Medina’s estate properties demand quiet equipment and careful placement. Wherever you are in the area, the same Kingswell standards apply: written price, firm arrival window, clean job site, and a guarantee in writing.
Serving Redmond, WA - Our Local Coverage Area
We’re based in the Redmond area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About AC Installation in Redmond
You can, but it won’t work. Your 1990s Redmond home was ducted for heat only, with trunk lines oversized for gentle furnace airflow and no return-air capacity for cooling CFM. A same-tonnage swap will spike static pressure, starve the coil, and fail King County inspection. We run a blower-speed audit and duct analysis first, then size the new equipment to what your house can actually move. Call (817) 402-2972 and we’ll show you the numbers.
Not always replaced, but almost always modified. The duct boots in 1985-2005 Redmond construction leak valley moisture from October through April, and the trunk lines are sized wrong for heat pump airflow. We typically seal and reconfigure existing metal ductwork, adding return-air pathways and balancing dampers, rather than full replacement. The exact scope depends on what our blower-door and duct-blaster tests reveal. We price this upfront, not as a surprise mid-job.
Usually not without work. The ducts in Redmond’s tech-boom tract homes were engineered for heating only, with supply registers high on walls or in floors where heat rises effectively. Cooling needs higher airflow, more return capacity, and registers positioned to dump cold air where it mixes. We test your system with a manometer and flow hood, then tell you exactly what modifications are needed before we quote equipment. No guesswork.
About forty percent of the Redmond homes we see need some electrical work. The 100-amp panels common in 1990s construction here often have no spare breaker slots, and the existing furnace circuit may be 15 amps when the air handler needs 20 or 30. We check this on our first site visit and include any panel work in our written price. If a licensed electrician is needed, we coordinate that scheduling so you’re not chasing contractors.
Most complete installations in Redmond fall between $3,500 and $7,500, with the majority of heat pump retrofits landing in the $4,500-$6,500 range after duct modifications. The final price depends on equipment efficiency, ductwork condition, and electrical readiness. We provide a written, itemized price before any work begins, and that price does not change. Call (817) 402-2972 for a free estimate at your Redmond home.
Written by Victor Mancini, Owner at Coldharbour Heating & Air, serving Redmond and the greater Eastside since 2003.