Look for electric parasites . These are plugged in things requiring electrity when used . Most people leave every single thing plugged in all the time even if they only use it once a month .
Unplug all power strips unless you use them frequently . In a spare room , I recently found a running power strip that no one has used in two years .
Switch to battery operated clocks and use rechargable batteries . This is a great tip if you ever have power outages .
If possible , air dry your clothes .
Avoid using your oven unless it is for short periods of time . Switch to appliances that use less electricity like the microwave or outdoor grill .
Heat food ingredients in the microwave first before adding them to a crock pot or stove simmering stew or soup .
Use clothes that require no ironing .
Air dry your hair .
Turn off absolutely everything whenever leaving a room .

Do you have (and use) central air? That's a big power draw.

I don't have any aircondtioning, and what I do in summer to keep the house cool is shut all the windows and close the blinds and shades by 9AM. My husband sometimes complains that it's like living in a cave, but it keeps the house really quite comfortable on all but the hottest days. It might seem to defeat the purpose of a sunroom, but perhaps you should put up some kind of curtains in there for the summer.

In the winter, I make sure to keep all the blinds and shades open to let as much sunlight in as I can.

gatormom has some good ideas above. Are you turning off lights, tv's, radios, computers, etc. when not in use? Do you run full loads of dishes and clothes? Can you use a clothesline instead of a dryer?

We have an electric stove, and most of the summer we grill outside instead of cooking inside. We really do this more because of the heat than the electricity bill, but it helps.

Good luck, and glad to see you have changed your evil ways, lol. Kids have a way of doing that to us, don't they?

:)
Dee

Griz, welcome to the land of frugal, conservation minded tree huggers! You're doing just great, so don't beat yourself up over the fact that you and your family are living!

Trying to do usage comparisons, even w/those close by, is often an exercise in futility. There are just too many variables effecting the bottom line, but that your awareness has been raised is a good thing.

Reading above and elsewhere on this site, I practice much of what's been stated, but not all. I consume within my own comfort level and conserve to the best of my ability. That's what should be done, not this knee-jerk PC reaction. We can't unring the bell of the past 50-100 years of growth w/detriments, but we can slow down the progressional damage - one household at a time. That's a good goal.

You've done your homework, tightened up where possible and that's great. Enjoy your home and your family. Just don't be wasteful (that's a biggie) and don't begrudge yourself, wife & kids the pleasures of life on Planet Earth. JMHO.

Do you have electric hot water? (I can't remember if that's part of the geothermal unit or not?). .
Do you have a hot-tub (ok, you'd probably have thought of that, but can't hurt to ask). Do you have travel trailer or RV that you keep plugged in (our elec usage went up I think 18% the month after we bought our trailer which my husband thought needed to be left plugged in to keep the battery charged. Not anymore!)
Do you have shade from trees? If you have AC (I drove through part of IL this summer, holy cow it was hot in July!) that could make a big difference in your usage.
Do you have a setback thermostat?
I've only had skylights in a house in Alaska, so I can't say for summer, but I know they were a big heat loser in winter. That house was built in '83, and was not nearly as efficient as I would have thought (our house before that was built in '52). I'd bet the sunroom is a big heater too. We have 6 large east facing windows in our 2 story family room. The bottom row has blinds. The top does not (yet - coming before next summer though). The morning heat gain is HUGE. HUGE! I can really feel it, I think even smell the heat when I come out of the bedroom with it's east/west crossbreeze into the 2nd floor hall which opens up above the family room. I think my house would stay cool most of the day if not for that set of windows.
This winter, keep an eye on your roof after a snow. Watch where it melts off first. Betcha have a heat leak there.
That said, it's tough to compare through a forum. There can be big differences nobody thinks to mention. I have a 3000 sf house as well, and yes your electric usage is higher than mine, but we have 2 people, 4 pets, no A/C, a climate that is quite cool with a breeze at night, even when hot during the day, gas hot water, minimal computer equipment turned on etc. You may not be comparing apples to apples. Have you talked to people in your area with a similar sized home?
Best of luck to you! I hope you do find your answer.

90 kwh does seem to be a lot. I just checked our bills and our daily average consumption for June, July, August was 9.87 kwh. The winter quarter Nov to Feb was 15.1 kwh ave per day. I have been trying to imagine what the differences are likely to be. There are three of us including teenage son. Four when daughter is home from uni. But we are out during the working day. The house was built 1820 and cannot be very well insulated. as it has solid single skin walls and sash windows, although we have done the best we can within the restrictions on an old home. I estimate it is about 2,200 square feet over 4 floors. It is a row house. Do you have electric heating? That would be a big difference. We have gas heating but it is not on between April and October. We have a gas hob but electric oven. We don't have or need AC. Some of the things you might be running which we don't have are: a cloths drier, garden irrigation system, automatic garage doors, plug in garden tools, small electric gadgets like carving knives, can openers, coffee grinders, food mixers etc., a garbage disposal, ceiling fans, microwave. We don't have a TV (I have to admit that we ARE rather unusual not having a microwave or TV.) But we do have several computers, several radios, a DVD player and projector, two freezers, a dishwasher and a washing machine (front loader). We keep the big main freezer out in the shed rather than in the warm kitchen. We downsized the fridge to an under the counter model and when our washer conked out we got the greenest rated new model we could find. But the discrepancy still seems very large. Perhaps you will need to do an even more careful check on the power consumption of your various appliances to find out where all that juice is going!

I use candles on the bathroom counter, the mirror obviously doubles the light. I do make up in the living room since we have a southern exposure. I also scotch-taped orange juice lids over the light switches- odd I know...but it makes you think if you really need to turn on the light.

Our electric usage tends to hover around 10-15 kWh/day year round. We have a newer house (1600 sqft built in 2002) and we added central air this year, so we saw a little bit more electric usage during the summer months but not much, since we set our thermostat higher during the day while we're at work. We have an electric range, and dryer, but gas heat and hot water.

You might check your refridgerator especially if it's an older one. They can be huge energy hogs.

If you have electric hot water, I'd look there too. If you do, try setting the thermostat on your hot water heater a little lower, and see if it helps.