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What makes Central City Air special?

We would like to explain what our systems consist of and why they are a far superior product than other systems offered to you by the competition.

We design our systems to remove greater quantities of humidity quicker through the use of properly sized evaporator coils with correctly sized balanced port stem adjustable expansion valves metering devices. For our 2-stage systems, we have a custom built, 2-stage evaporator coil designed by Central City Air. This coil has been engineered and ARI rated exclusively for Central City Air.


Attic Requirements

  • Required light switch by service access and light bulb over equipment on service area. Equipment must be within 20 feet of access point.
  • Scuttle hole has to be as large as the largest piece of attic equipment, but no smaller than 30" x 30" per current city codes.
  • Install plywood flooring where possible for service area as required by code. A minimum of 30" of decking from access to service area and 36" of decked service area around equipment. (Central City Air provides this service to our customers).
  • New city code requires property owners to install access ladders to the attic with a capacity rating of no less than 350 pounds. It is the property owners' responsibility to comply with these standards. Please note: Central City Air does not install attic access ladders.

Central City Air Exclusivities

  • All of our custom sheet metal is manufactured by Central City Air for your job specifically. This includes any sheet metal connecting the coil, furnace, and filter system (if used). Our supply air transitions and plenums are lined with 2-lb. density insulated plenums as required by city and state code requirements.
  • Central City Air will cover and protect the flooring and haul away all trash and, per EPA regulations, all old contaminated equipment. This contaminated equipment becomes the responsibility of Central City Air.
  • Central City Air employees perform all work. We do not use subcontractors (licensed or un-licensed) on any of our installations.
  • We have been licensed to do business in Houston since 1973, with a Class A City of Houston license.
  • Our warranty is one-year parts and one-year labor on all service repairs. Check this out with any other company.
  • All installations are regulated by state codes. City code regulations are governed by state requirements.
  • All permits are pulled as required by controlling jurisdiction and covered by state code at an additional cost to customer.

In our opinion, all homes require proper radiant and thermal barriers along with ventilation and attic insulation for any system to work at the manufacturer's designed parameters. Therefore, we recommend you get an insulation and ventilation analysis of your attic. We truly believe in putting in ridge vents, soffit vents, a minimum R-19 non-itching (white) fiberglass insulation and/or radiance paint.

All of our condensers are installed as follows:

  • Pump down system or reclaim refrigerant.
  • New condenser pad installed with the unit (if required).
  • 4 corner blocks and a center support to raise the pad and unit up off the ground as needed.
  • Liquid line drier to keep the refrigerant clean.
  • New electrical whip from disconnect to the condenser (if required).
  • 15% silver solder to tie in all copper.
  • Insulated suction line with weatherproof tape to seal and meet 2003 IC.
  • Refrigerant required for balancing the system after deep vacuum service to system.
  • Electrical check out of proper amp draw.
  • Grounding rod.
  • Hard start kit if required.
  • *Suction line drier if required. If installed, suction line drier should be removed within 12 months.
  • New electrical disconnect installed to meet code if required.
  • Haul away all old equipment.

*If suction line drier is required, customer is responsible for having it removed 9-12 months after it is installed

Per Texas State law, a qualified, licensed electrical contractor must update breakers and undersized wiring. If electrical is not up to code, customer is responsible for hiring a licensed electrician for compliance work. Electrical permits are not included in central City Air's price for work.

All of our evaporator coils are installed as follows:

  • City and state code required heavy-duty custom 2 pound density insulation for sheet metal transition from the furnace to the coil. (Horizontal only)
  • New super insulated 2 pound density insulation for sheet metal supply air plenum and custom designed balancing dampers.
  • Mastic duct sealer is used to seal the duct joints involved in the installation.
  • New heavy-duty composite welded auxiliary overflow pan. *(Horizontal coils only).
  • Tie the main drain and overflow drains and upgrade if required to improve drainage.
  • "Tee" and shut off valve in the drain lines to assist in cleaning the drain line.
  • Replace exposed drain lines with new lines as far as accessible to current codes.
  • Adjustable expansion valve and sight glass used to balance refrigerant charge.
  • Hard start kit on the condenser unit if required.
  • City and state code required access doors on both sides of the cooling coil for easy inspection and cleaning when required.
  • Install plywood flooring where possible for service area as required by code.

*Our secondary drain pan (for horizontal slab coils only) is custom built of heavy-duty stainless steel composite materials for increased life. Should the overflow pan fill up with water, stainless steel pans avoid the rusty water runoff.

Your new coil is designed to outperform the existing coil. Therefore, it will pull out more humidity causing more water flow to your drain. It is advisable to have your drain lines snaked by a plumber to alleviate any blockages or situations that may cause a backup. Central City Air is not responsible for clogged drain lines or damage caused by clogged drain lines. By Texas state law, Central City Air can only work on the drain line to its termination point to the home plumbing system.

All of our furnaces are installed as follows:

  • New double wall vent pipe, cap and flashing (if required) to composition roof.
  • New gas shut off as required by code (gas cock).
  • Stainless Steel gas flex line.
  • Hard pipe black gas line connection from flex gas line to gas valve to meet furnace code.
  • City & state code required custom, heavy-duty 2 pound density insulated sheet metal transition to the cooling coil as required for secure attachment.
  • Suspend furnace from the rafters, if possible, with unistrut and solid metal straps.*
  • Mastic duct sealer is used to seal the duct joints involved in the installation.

*We hang our furnaces for sound attenuation. This also gives the furnace additional support as today's furnaces are not as rigid as older models, and if not supported properly, can sag and cause air leaks and possible separation of components in the unit. Our furnaces are supported across the width and length of the unit and do not sag. Hanging the units also allows us to raise them higher which allows the coil to drain better.


Central City Air offers all of our customers 3 types of ductwork: flex duct, hybrid, and hard pipe. Our basic system is flex duct. Our hybrid system is a combination of flex and hard pipe. Actual percentage based on specific design application, and upon the design of the house. The hard pipe system is 100% hard pipe for supply and return trunk lines are a combination of flex and hard pipe, depending upon the design of the house.

Our supply ductwork is round sheet metal pipe with all joints secured with three (3) screws and sealed with "UL" listed mastic duct sealer. The ductwork is then wrapped with 2-inch foil backed fiberglass insulation, secured with mechanical hand installed staples. Central City Air has used this method for many years because it is the proper way to ensure a quality product that does not leak air, spread dust through out the house or fail. Ductwork installed in this manner will allow for balanced, clean, higher quality air.

Ductwork does not include the replacement of supply register boxes, supply air grills or return air grills, each of these are addressed as separate issues if changes are required. Grill sizes available may vary from your current grills. Different manufacturers' dimensions may not match the existing grill opening. Central City Air does not do any sheetrock patching or repair work. After the job is complete you should contact your painter/sheetrock repairperson to do any necessary retrofit work.