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The work we would rather you did before you rang us
Insulation, air sealing and glazing are not our trade and we make nothing from them. They are also, in a good number of houses here, the reason you are reading a page about air conditioning.
The argument, in one paragraph. A cooling system fights heat that gets into the house. Insulation, air sealing and glazing reduce how much gets in. Do those first and the load goes down, which means the system you need is smaller, costs less to buy, costs less to run and — because it runs for longer at a lower output — usually makes the house feel better as well. Do it the other way round and you buy a machine sized for a house you are about to change.
The three things are not equal, and the order matters. Air sealing is usually the cheapest and the most underrated. Attic insulation is next, and in this county it is the one most often found lacking. Glazing is the most expensive by a distance and the slowest to pay back, which is why it belongs at the end of the list rather than at the front of a sales pitch.
What we get out of this: nothing. We do not sell insulation, we do not quote it, and we do not take referral fees. That is not a virtue, it is what makes the advice worth reading.
Pick the complaint and what your house already has. Everything below is written out in full.
A house with upgraded glazing and proper attic insulation that is still uncomfortable has a distribution or equipment problem, and you can stop wondering about the building. That narrows it enormously.
What it is, in rough order of likelihood. Duct leakage, which is invisible and is the single commonest finding in this county. Static pressure too high for the system, which starves it of air. A return path that cannot get air back from the rooms that are wrong. Airflow simply never balanced after somebody worked on it. Or — genuinely, and more often than you would think in an upgraded house — a system that is now too big, because it was sized before the work and nobody redid the sums.
That last one is worth dwelling on. People upgrade a house, stay uncomfortable, and conclude the system is too small. An oversized system in a tight house short cycles, never runs long enough to dehumidify, and feels exactly like inadequate cooling. The measurements tell you which, and they take under an hour.
One room is much hotter than the rest
The most common complaint in this town and the one where the envelope is most often the cause rather than the system.
Look at what is above it. A room under a section of attic with thin, disturbed or missing insulation will be hot no matter what comes out of the register. Insulation gets flattened by anybody who has crawled up there, it gets pulled back around light fittings and never replaced, and around the hatch it is frequently simply absent.
Then look at what faces it. A west-facing room with a lot of glass in this county is a different room after three in the afternoon. That is solar gain, and the honest fixes are shading, glazing and — cheapest of all — something as ordinary as a blind used at the right hour.
Then the duct. A crushed or disconnected run, a damper set years ago, a missing return path so air cannot leave the room. All measurable.
Adding capacity to the whole house to fix one room is the expensive answer and it usually does not work, because the air still has to arrive in that room.
The house loses ground on the worst days
First, a piece of reassurance: a system that holds the house all morning and slips two or three degrees between three and six on the hottest week of the year is behaving normally. Equipment is sized for a design condition, not for the worst afternoon of the decade, and continuous running at that point is correct rather than faulty.
If it is losing more than that, or losing it earlier, the question is where the heat is arriving from. In a single-storey house with attic ducts the answer is above you far more often than it is outside.
The specific pair that causes this is thin attic insulation combined with leaky duct in that same attic. The insulation lets heat through the ceiling; the duct leakage pulls 130-degree air into the system and delivers it to your rooms. Each one is bad. Together they are the reason a correctly sized system cannot hold a house.
Fix those two and a great many houses stop losing ground without anybody buying equipment.
The bills
Worth being honest about the arithmetic here, because this is where the most optimistic claims in the trade get made.
Air sealing is usually the best value and the least visible. It is not glamorous, nobody photographs it, and in an older house it is frequently the cheapest meaningful reduction available.
Attic insulation is next, and in a house that still has its original depth it is a real change rather than a marginal one.
Duct sealing sits alongside both and is our trade rather than somebody else’s — and it is measurable, which almost nothing else on this list is. A leakage test before and after gives you a number.
New glazing is the most expensive and the slowest to repay. It does other things well — comfort near the window, noise, appearance — and those are legitimate reasons. Buying windows primarily to reduce a bill is a long wait.
What we will not do is give you a percentage for any of it. It depends on your house, your summer and what you set the thermostat to, and every printed figure comes from the flattering case.
A room over, or next to, the garage
The hardest room in a house, and it is almost never the fault of the equipment.
A garage is unconditioned, frequently uninsulated, and in this climate it gets very hot. A room sharing a wall or a floor with it is being heated from a direction the rest of the house is not. On top of that, the floor over a garage is often poorly insulated and open to the garage ceiling cavity.
And there is a second problem that is not comfort. Air moves from a garage into a house through gaps in the shared wall, ceiling and door. What is in a garage — a car, fuel, solvents, paint — is not what you want moving into a bedroom. Sealing that boundary is worth doing for the air even if the temperature never bothered you.
This is the case where the envelope work is most clearly the answer, and where adding a separate ductless system for the room afterwards is often sensible. In that order: seal and insulate, then condition.
You are replacing the system anyway
Then this page matters more to you than to anybody else, because you are about to fix the size of your cooling system for the next fifteen years.
If envelope work is planned, do it first or calculate for it. A load calculation done on today’s house will produce a system that is oversized for next year’s. Oversized is not a safe error: it short cycles, it does not dehumidify, and it wears faster.
If it is not planned but you are considering it, say so during the survey. A calculation can be run both ways, and seeing the two figures side by side is usually the moment people decide about the attic.
And do the ductwork thinking now. New equipment on old leaky duct in a hot attic will disappoint you in the same way the old system did. This is the one moment when everything is open for discussion and the incremental cost is smallest.
The insulation it was built with
Common here, and the single biggest opportunity in the house. Building standards have moved several times since most of Costa Mesa went up, and a house at its original depth is a long way below what is expected now.
What to ask an insulation contractor for: the current depth measured in several places rather than one, what it is sitting on, whether the attic has been air sealed before anything is added, and whether the ducts will end up buried. Air sealing before topping up is the part most often skipped and it matters more than the depth does.
Also ask about the hatch and around any recessed lights. Those are small areas doing a disproportionate amount of damage, and they are cheap.
Insulation topped up at some point
Better, and worth checking rather than assuming, because “topped up” covers everything from a proper job to a thin layer blown over the top of a mess.
Three things to look for. Whether it is even — blown insulation settles and gets walked on, and a thin patch does more harm than the average depth suggests. Whether it was air sealed first, because adding depth over unsealed penetrations traps the problem rather than solving it. And whether the ducts are now buried in it, which is not automatically bad but changes how leakage behaves and is worth knowing.
If it was done more than fifteen years ago it was probably done to a lower standard than you would get today, and a second look is not wasted.
Old aluminium or single-pane windows
Genuinely a large heat gain, particularly on west and south elevations in this county, and genuinely the most expensive thing on this page to put right. Both of those are true at once and neither should be hidden from you.
The honest ordering. Do the attic and the air sealing first, because they cost a fraction as much and reduce more. Then, if the windows still bother you, replace them for the reasons they are actually good at — comfort sitting near them, noise, draughts, appearance — and treat any reduction in the bill as a bonus rather than the business case.
And consider the cheap version first. External shading on the worst elevation, or simply closing a blind on the west side at two in the afternoon, is free and does more than people expect. We have been in houses where that alone settled the complaint.
Already upgraded
See the note above, which is the substance of it. The short version: the building is no longer your variable, so the answer is in the distribution or the equipment, and that is a much smaller search.
One thing worth adding. If the upgrade happened after the system was installed, the system was sized for a house that no longer exists. That does not automatically mean it is wrong, but it does mean the numbers are worth redoing before anybody replaces anything.
What to do first
Get somebody to look in the attic directly above that room, and check what the window faces. Then get the airflow measured at that register. Between them those three checks settle the great majority of hot-room complaints, and none of them involves buying equipment.
What to do first
Get a duct leakage test and an honest look at the attic insulation, in the same visit. Those two together cause more of this complaint than any other pair, and both are cheaper to fix than capacity.
What to do first
Air sealing, then attic insulation, then duct sealing — and windows last. That order is not a preference, it is what the money does. And do not accept a percentage from anybody, including an insulation contractor.
What to do first
Seal and insulate the boundary between the garage and the house before you add any equipment. Do it for the air as much as the temperature. Then, if the room still needs it, a separate ductless system is usually the right answer.
What to do first
Decide about the envelope before the load calculation, not after. If you are insulating this year, tell whoever is sizing the system. It will usually make the system smaller, and smaller is cheaper twice.
What this page is not
It is not a sales page for another trade. We take no referral fee, we have no arrangement with anybody, and we will not name a contractor unless you ask and we happen to know one.
It is not a promise that insulation will fix your house. Sometimes the system genuinely is undersized, failing or badly installed, and we will say so with the readings that show it. The point is the order of investigation, not a predetermined answer.
And it contains no figures — no percentages, no payback periods, no R-values recommended from a web page. Those depend on your house, and every number printed on a page like this comes from whichever case made it look best.
The visit that decides the order
The attic looked at, the duct measured, the airflow checked at the rooms that are wrong, and a written note of what we would do in what order — including the parts that are not our work.